From 218d91d702bd5b9c1517beb4cdea7f04c4e459ff Mon Sep 17 00:00:00 2001
From: GitHub Actions <actions@github.com>
Date: Wed, 7 Jun 2023 13:19:14 +0000
Subject: [PATCH] site deploy

Auto-generated via {sandpaper}
Source  : 985cfc44affec0a3b22f6898f4c8ffc2e6ced0f6
Branch  : md-outputs
Author  : GitHub Actions <actions@github.com>
Time    : 2023-06-07 13:18:40 +0000
Message : markdown source builds

Auto-generated via {sandpaper}
Source  : f6dac548b648fe51850e4b484b8dc1ab9d94d862
Branch  : main
Author  : Martino Sorbaro <martinosorb@users.noreply.github.com>
Time    : 2023-06-07 13:17:06 +0000
Message : Merge pull request #641 from wgriffa/patch-2

Update 01-run-quit.md
---
 01-run-quit.html                     |  20 +++--
 02-variables.html                    |   2 +-
 03-types-conversion.html             |  16 ++--
 04-built-in.html                     |  10 +--
 05-coffee.html                       |   2 +-
 06-libraries.html                    |  18 ++--
 07-reading-tabular.html              |   2 +-
 08-data-frames.html                  |   2 +-
 09-plotting.html                     |  10 +--
 10-lunch.html                        |   2 +-
 11-lists.html                        |   2 +-
 12-for-loops.html                    |  22 ++---
 13-conditionals.html                 |  10 +--
 14-looping-data-sets.html            |   8 +-
 15-coffee.html                       |   2 +-
 16-writing-functions.html            |  20 ++---
 17-scope.html                        |   4 +-
 18-style.html                        |   6 +-
 19-wrap.html                         |   2 +-
 20-feedback.html                     |   2 +-
 404.html                             |   4 +-
 CODE_OF_CONDUCT.html                 |   2 +-
 LICENSE.html                         |   2 +-
 aio.html                             | 124 ++++++++++++++-------------
 design.html                          |   2 +-
 discuss.html                         |   2 +-
 exercises.html                       |   2 +-
 images.html                          |   4 +-
 index.html                           |   4 +-
 instructor-notes.html                |   4 +-
 instructor/01-run-quit.html          |  20 +++--
 instructor/02-variables.html         |   2 +-
 instructor/03-types-conversion.html  |  16 ++--
 instructor/04-built-in.html          |  10 +--
 instructor/05-coffee.html            |   2 +-
 instructor/06-libraries.html         |  18 ++--
 instructor/07-reading-tabular.html   |   2 +-
 instructor/08-data-frames.html       |   2 +-
 instructor/09-plotting.html          |  10 +--
 instructor/10-lunch.html             |   2 +-
 instructor/11-lists.html             |   2 +-
 instructor/12-for-loops.html         |  22 ++---
 instructor/13-conditionals.html      |  10 +--
 instructor/14-looping-data-sets.html |   8 +-
 instructor/15-coffee.html            |   2 +-
 instructor/16-writing-functions.html |  20 ++---
 instructor/17-scope.html             |   4 +-
 instructor/18-style.html             |   6 +-
 instructor/19-wrap.html              |   2 +-
 instructor/20-feedback.html          |   2 +-
 instructor/404.html                  |   4 +-
 instructor/CODE_OF_CONDUCT.html      |   2 +-
 instructor/LICENSE.html              |   2 +-
 instructor/aio.html                  | 124 ++++++++++++++-------------
 instructor/design.html               |   2 +-
 instructor/discuss.html              |   2 +-
 instructor/exercises.html            |   2 +-
 instructor/images.html               |   4 +-
 instructor/index.html                |   4 +-
 instructor/instructor-notes.html     |   4 +-
 instructor/key-points.html           |   4 +-
 instructor/profiles.html             |   4 +-
 instructor/reference.html            |   2 +-
 key-points.html                      |   4 +-
 md5sum.txt                           |   2 +-
 pkgdown.yml                          |   2 +-
 profiles.html                        |   4 +-
 reference.html                       |   2 +-
 68 files changed, 328 insertions(+), 320 deletions(-)

diff --git a/01-run-quit.html b/01-run-quit.html
index 9455bbbb3..9697144cf 100644
--- a/01-run-quit.html
+++ b/01-run-quit.html
@@ -382,7 +382,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Running and Quitting</h1>
-        <p> Last updated on 2023-05-18 | 
+        <p> Last updated on 2023-06-07 | 
         
         <a href="https://github.com/swcarpentry/python-novice-gapminder/edit/main/episodes/01-run-quit.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
         
@@ -632,6 +632,8 @@ <h3 id="main-work-area">Main Work Area<a class="anchor" aria-label="anchor" href
 (notebooks, text files, etc.) and other activities (terminals, code
 consoles, etc.) into panels of tabs that can be resized or subdivided. A
 screenshot of the default Main Work Area is provided below.</p>
+<p>If you do not see the Launcher tab, click the blue plus sign under
+the “File” and “Edit” menus and it will appear.</p>
 <p align="center">
 <img alt="JupyterLab Main Work Area" src="fig/0_jupyterlab_main_work_area.png" width="750" class="figure"></p>
 <p>Drag a tab to the center of a tab panel to move the tab to the panel.
@@ -716,7 +718,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>After creating the necessary tabs, you can drag one of the tabs to
 the center of a panel to move the tab to the panel; next you can
@@ -783,7 +785,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Command mode has a grey border and Edit mode has a blue border. Use
 <kbd>Esc</kbd> and <kbd>Return</kbd> to switch between modes. You need
@@ -947,7 +949,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This challenge integrates both the numbered list and bullet list.
 Note that the bullet list is indented 2 spaces so that it is inline with
@@ -990,7 +992,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Python returns the output of the last calculation.</p>
 <div class="codewrapper sourceCode" id="cb12">
@@ -1035,7 +1037,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>The Python code gets treated like Markdown text. The lines appear as
 if they are part of one contiguous paragraph. This could be useful to
@@ -1075,7 +1077,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>The notebook shows the equation as it would be rendered from LaTeX
 equation syntax. The dollar sign, <code>$</code>, is used to tell
@@ -1185,8 +1187,8 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "url": "https://swcarpentry.github.io/python-novice-gapminder/01-run-quit.html",
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/01-run-quit.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2023-05-18",
-  "datePublished": "2023-06-06"
+  "dateModified": "2023-06-07",
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/02-variables.html b/02-variables.html
index 69f1f0725..9397c7fdf 100644
--- a/02-variables.html
+++ b/02-variables.html
@@ -1012,7 +1012,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/02-variables.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/03-types-conversion.html b/03-types-conversion.html
index e2682092b..276518538 100644
--- a/03-types-conversion.html
+++ b/03-types-conversion.html
@@ -651,7 +651,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>It is a floating-point number (often abbreviated “float”). It is
 possible to find out by using the built-in function
@@ -689,7 +689,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>It is a float: integers are automatically converted to floats as
 necessary.</p>
@@ -737,7 +737,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The answers to the questions are:</p>
 <ol style="list-style-type: decimal"><li>Integer, since the number of days would lie between 1 and 365.</li>
@@ -795,7 +795,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We want the minimum number of surveys that reaches everyone once,
 which is the rounded up value of
@@ -881,7 +881,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>What do you expect this program to do? It would not be so
 unreasonable to expect the Python 3 <code>int</code> command to convert
@@ -952,7 +952,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Answer: 1 and 4</p>
 </div>
@@ -999,7 +999,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>Standard mathematics treatments typically use <code>i</code> to
 denote an imaginary number. However, from media reports it was an early
@@ -1092,7 +1092,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/03-types-conversion.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/04-built-in.html b/04-built-in.html
index e43b9163a..03130c795 100644
--- a/04-built-in.html
+++ b/04-built-in.html
@@ -736,7 +736,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>Order of operations:</li>
 <li><code>1.1 * radiance = 1.1</code></li>
@@ -782,7 +782,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb30">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -850,7 +850,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p><code>max</code> and <code>min</code> return TypeErrors in this case
 because the correct number of parameters was not supplied. If it just
@@ -883,7 +883,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p><code>name[len(name) - 1]</code></p>
 </div>
@@ -991,7 +991,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/04-built-in.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/05-coffee.html b/05-coffee.html
index d9bcdd586..6a25661ef 100644
--- a/05-coffee.html
+++ b/05-coffee.html
@@ -449,7 +449,7 @@ <h1>Morning Coffee</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/05-coffee.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/06-libraries.html b/06-libraries.html
index dfa46040d..9f594183c 100644
--- a/06-libraries.html
+++ b/06-libraries.html
@@ -583,7 +583,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p>Using <code>help(math)</code> we see that we’ve got
 <code>pow(x,y)</code> in addition to <code>sqrt(x)</code>, so we could
@@ -629,7 +629,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>The <a href="https://docs.python.org/3/library/random.html" class="external-link">random
 module</a> seems like it could help.</p>
@@ -711,7 +711,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb15">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -753,7 +753,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Importing the math module (<code>import math</code>)</p>
 </div>
@@ -790,7 +790,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb18">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -846,7 +846,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>Library calls 1 and 4. In order to directly refer to
 <code>sin</code> and <code>pi</code> without the library name as prefix,
@@ -904,7 +904,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb21">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -951,7 +951,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1046,7 +1046,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/06-libraries.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/07-reading-tabular.html b/07-reading-tabular.html
index 3d9a7fdb5..7c9094f5a 100644
--- a/07-reading-tabular.html
+++ b/07-reading-tabular.html
@@ -1005,7 +1005,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/07-reading-tabular.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/08-data-frames.html b/08-data-frames.html
index 6ec65ec42..343be3bfa 100644
--- a/08-data-frames.html
+++ b/08-data-frames.html
@@ -1370,7 +1370,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/08-data-frames.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-06-05",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/09-plotting.html b/09-plotting.html
index 0a845a05e..9fb3aa3ac 100644
--- a/09-plotting.html
+++ b/09-plotting.html
@@ -633,7 +633,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb14">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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@@ -714,7 +714,7 @@ <h4 class="accordion-header" id="headingSolution3">
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   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <figure><img src="fig/9_correlations_solution2.png" alt="Correlations Solution 2" class="figure mx-auto d-block"></figure><p>Seems the variability in this value is due to a sharp drop after
 1972. Some geopolitics at play perhaps? Given the dominance of oil
@@ -754,7 +754,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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 <div class="accordion-body">
 <figure><img src="fig/9_more_correlations_solution.svg" alt="More Correlations Solution" class="figure mx-auto d-block"></figure><p>A good place to look is the documentation for the plot function -
 help(data_all.plot).</p>
@@ -913,7 +913,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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diff --git a/10-lunch.html b/10-lunch.html
index aad42ced4..2b658445f 100644
--- a/10-lunch.html
+++ b/10-lunch.html
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diff --git a/11-lists.html b/11-lists.html
index 734d78625..3bf9c17cb 100644
--- a/11-lists.html
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diff --git a/12-for-loops.html b/12-for-loops.html
index 7dc834d2c..d6c54f020 100644
--- a/12-for-loops.html
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   </h4>
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-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>An IndentationError is a syntax error. Programs with syntax errors
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@@ -654,7 +654,7 @@ <h4 class="accordion-header" id="headingSolution2">
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 <table class="table"><thead><tr class="header"><th>Line no</th>
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@@ -705,7 +705,7 @@ <h4 class="accordion-header" id="headingSolution3">
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-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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@@ -791,7 +791,7 @@ <h4 class="accordion-header" id="headingSolution5">
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   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
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@@ -873,7 +873,7 @@ <h4 class="accordion-header" id="headingSolution7">
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   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -919,7 +919,7 @@ <h4 class="accordion-header" id="headingSolution8">
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   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -973,7 +973,7 @@ <h4 class="accordion-header" id="headingSolution9">
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   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
+<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
 <div class="accordion-body">
 <ul><li>Python variable names are case sensitive: <code>number</code> and
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@@ -1026,7 +1026,7 @@ <h4 class="accordion-header" id="headingSolution10">
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   </h4>
 </button>
-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
+<div id="collapseSolution10" class="accordion-collapse collapse" data-bs-parent="#accordionSolution10" aria-labelledby="headingSolution10">
 <div class="accordion-body">
 <p>This list has 4 elements and the index to access the last element in
 the list is <code>3</code>.</p>
@@ -1117,7 +1117,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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diff --git a/13-conditionals.html b/13-conditionals.html
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-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -792,7 +792,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -840,7 +840,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -891,7 +891,7 @@ <h4 class="accordion-header" id="headingSolution4">
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   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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 <div class="codewrapper sourceCode" id="cb26">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1017,7 +1017,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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diff --git a/14-looping-data-sets.html b/14-looping-data-sets.html
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--- a/14-looping-data-sets.html
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>1 is not matched by the glob.</p>
 </div>
@@ -586,7 +586,7 @@ <h4 class="accordion-header" id="headingSolution2">
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   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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@@ -629,7 +629,7 @@ <h4 class="accordion-header" id="headingSolution3">
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   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This solution builds a useful legend by using the <a href="https://docs.python.org/3/library/stdtypes.html#str.split" class="external-link">string
 <code>split</code> method</a> to extract the <code>region</code> from
@@ -762,7 +762,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
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diff --git a/15-coffee.html b/15-coffee.html
index 91ff6857f..317b82099 100644
--- a/15-coffee.html
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
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index 239d7bf62..61498e32a 100644
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@@ -647,7 +647,7 @@ <h4 class="accordion-header" id="headingSolution2">
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   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -718,7 +718,7 @@ <h4 class="accordion-header" id="headingSolution3">
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   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p>The problem with the example is that the function
 <code>print_time()</code> is defined <em>after</em> the call to the
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   </h4>
 </button>
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-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
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-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><code>2003/2/1</code></li>
 <li>We saw examples of using <em>named arguments</em> when working with
@@ -962,7 +962,7 @@ <h4 class="accordion-header" id="headingSolution7">
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   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
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 <div class="codewrapper sourceCode" id="cb34">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1040,7 +1040,7 @@ <h4 class="accordion-header" id="headingSolution8">
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   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>The average GDP for Japan across the years reported for the 1980s is
 computed with:</li>
@@ -1141,7 +1141,7 @@ <h4 class="accordion-header" id="headingSolution9">
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   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
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 <ol style="list-style-type: decimal"><li><div class="codewrapper sourceCode" id="cb43">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1309,7 +1309,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/17-scope.html b/17-scope.html
index 373f502d5..f1cc5f985 100644
--- a/17-scope.html
+++ b/17-scope.html
@@ -538,7 +538,7 @@ <h4 class="accordion-header" id="headingSolution1">
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>Three levels.</li>
 <li><code>errors_02.py</code></li>
@@ -622,7 +622,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/17-scope.html",
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diff --git a/18-style.html b/18-style.html
index a27c4cf00..578c2b87d 100644
--- a/18-style.html
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@@ -587,7 +587,7 @@ <h4 class="accordion-header" id="headingSolution1">
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   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb7">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -646,7 +646,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Here’s one solution.</p>
 <div class="codewrapper sourceCode" id="cb9">
@@ -764,7 +764,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/18-style.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/19-wrap.html b/19-wrap.html
index f8f35fa38..d8b57a09b 100644
--- a/19-wrap.html
+++ b/19-wrap.html
@@ -502,7 +502,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/19-wrap.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/20-feedback.html b/20-feedback.html
index 94ebc0057..024d41aab 100644
--- a/20-feedback.html
+++ b/20-feedback.html
@@ -472,7 +472,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/20-feedback.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/404.html b/404.html
index 3c62b6274..ce1af1da3 100644
--- a/404.html
+++ b/404.html
@@ -416,8 +416,8 @@ <h1>Page not found</h1>
   "url": "https://swcarpentry.github.io/python-novice-gapminder/404.html",
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/404.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2023-06-06",
-  "datePublished": "2023-06-06"
+  "dateModified": "2023-06-07",
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index b63a70782..155f0bac5 100644
--- a/CODE_OF_CONDUCT.html
+++ b/CODE_OF_CONDUCT.html
@@ -440,7 +440,7 @@ <h1>Contributor Code of Conduct</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/CODE_OF_CONDUCT.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/LICENSE.html b/LICENSE.html
index a53b0e334..efbecb3c9 100644
--- a/LICENSE.html
+++ b/LICENSE.html
@@ -491,7 +491,7 @@ <h1>Licenses</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/LICENSE.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/aio.html b/aio.html
index 5939dde35..5bbaca8ed 100644
--- a/aio.html
+++ b/aio.html
@@ -468,7 +468,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
         
 <section id="aio-01-run-quit"><p>Content from <a href="01-run-quit.html">Running and Quitting</a></p>
 <hr>
-<p> Last updated on 2023-05-18 | 
+<p> Last updated on 2023-06-07 | 
         
         <a href="https://github.com/swcarpentry/python-novice-gapminder/edit/main/episodes/01-run-quit.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
 <div class="text-end">
@@ -733,6 +733,8 @@ <h3 id="main-work-area">Main Work Area<a class="anchor" aria-label="anchor" href
 (notebooks, text files, etc.) and other activities (terminals, code
 consoles, etc.) into panels of tabs that can be resized or subdivided. A
 screenshot of the default Main Work Area is provided below.</p>
+<p>If you do not see the Launcher tab, click the blue plus sign under
+the “File” and “Edit” menus and it will appear.</p>
 <p align="center">
 <img alt="JupyterLab Main Work Area" src="fig/0_jupyterlab_main_work_area.png" width="750" class="figure"></p>
 <p>Drag a tab to the center of a tab panel to move the tab to the panel.
@@ -828,7 +830,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>After creating the necessary tabs, you can drag one of the tabs to
 the center of a panel to move the tab to the panel; next you can
@@ -900,7 +902,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Command mode has a grey border and Edit mode has a blue border. Use
 <kbd>Esc</kbd> and <kbd>Return</kbd> to switch between modes. You need
@@ -1091,7 +1093,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This challenge integrates both the numbered list and bullet list.
 Note that the bullet list is indented 2 spaces so that it is inline with
@@ -1134,7 +1136,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Python returns the output of the last calculation.</p>
 <div class="codewrapper sourceCode" id="cb12">
@@ -1179,7 +1181,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>The Python code gets treated like Markdown text. The lines appear as
 if they are part of one contiguous paragraph. This could be useful to
@@ -1219,7 +1221,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>The notebook shows the equation as it would be rendered from LaTeX
 equation syntax. The dollar sign, <code>$</code>, is used to tell
@@ -2199,7 +2201,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>It is a floating-point number (often abbreviated “float”). It is
 possible to find out by using the built-in function
@@ -2237,7 +2239,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>It is a float: integers are automatically converted to floats as
 necessary.</p>
@@ -2287,7 +2289,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The answers to the questions are:</p>
 <ol style="list-style-type: decimal">
@@ -2347,7 +2349,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We want the minimum number of surveys that reaches everyone once,
 which is the rounded up value of
@@ -2433,7 +2435,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>What do you expect this program to do? It would not be so
 unreasonable to expect the Python 3 <code>int</code> command to convert
@@ -2506,7 +2508,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Answer: 1 and 4</p>
 </div>
@@ -2555,7 +2557,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>Standard mathematics treatments typically use <code>i</code> to
@@ -2992,7 +2994,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>Order of operations:</li>
@@ -3042,7 +3044,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb30">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3110,7 +3112,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p><code>max</code> and <code>min</code> return TypeErrors in this case
 because the correct number of parameters was not supplied. If it just
@@ -3143,7 +3145,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p><code>name[len(name) - 1]</code></p>
 </div>
@@ -3444,7 +3446,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p>Using <code>help(math)</code> we see that we’ve got
@@ -3494,7 +3496,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>The <a href="https://docs.python.org/3/library/random.html" class="external-link">random
 module</a> seems like it could help.</p>
@@ -3576,7 +3578,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb15">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3618,7 +3620,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Importing the math module (<code>import math</code>)</p>
 </div>
@@ -3657,7 +3659,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb18">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3717,7 +3719,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>Library calls 1 and 4. In order to directly refer to
@@ -3779,7 +3781,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb21">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3828,7 +3830,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5712,7 +5714,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb14">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5750,7 +5752,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb15">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5794,7 +5796,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <figure><img src="fig/9_correlations_solution2.png" alt="Correlations Solution 2" class="figure mx-auto d-block"></figure><p>Seems the variability in this value is due to a sharp drop after
 1972. Some geopolitics at play perhaps? Given the dominance of oil
@@ -5834,7 +5836,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <figure><img src="fig/9_more_correlations_solution.svg" alt="More Correlations Solution" class="figure mx-auto d-block"></figure><p>A good place to look is the documentation for the plot function -
 help(data_all.plot).</p>
@@ -6945,7 +6947,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>An IndentationError is a syntax error. Programs with syntax errors
 cannot be started. A program with a runtime error will start but an
@@ -6982,7 +6984,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <table class="table">
 <thead><tr class="header">
@@ -7053,7 +7055,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb18">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7097,7 +7099,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb20">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7139,7 +7141,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb22">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7182,7 +7184,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb24">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7221,7 +7223,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
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 <div class="codewrapper sourceCode" id="cb25">
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   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
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 <div class="codewrapper sourceCode" id="cb27">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
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 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
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 <div class="accordion-body">
 <ul>
 <li>Python variable names are case sensitive: <code>number</code> and
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   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
+<div id="collapseSolution10" class="accordion-collapse collapse" data-bs-parent="#accordionSolution10" aria-labelledby="headingSolution10">
 <div class="accordion-body">
 <p>This list has 4 elements and the index to access the last element in
 the list is <code>3</code>.</p>
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   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="codewrapper">
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@@ -7857,7 +7859,7 @@ <h4 class="accordion-header" id="headingSolution2">
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   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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@@ -7956,7 +7958,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>1 is not matched by the glob.</p>
 </div>
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   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <div class="codewrapper sourceCode" id="cb10">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8293,7 +8295,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This solution builds a useful legend by using the <a href="https://docs.python.org/3/library/stdtypes.html#str.split" class="external-link">string
 <code>split</code> method</a> to extract the <code>region</code> from
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   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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@@ -8695,7 +8697,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8772,7 +8774,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p>The problem with the example is that the function
@@ -8823,7 +8825,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
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@@ -8868,7 +8870,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb27">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8934,7 +8936,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><code>2003/2/1</code></li>
@@ -9024,7 +9026,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
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 <div class="codewrapper sourceCode" id="cb34">
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@@ -9108,7 +9110,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>The average GDP for Japan across the years reported for the 1980s is
@@ -9219,7 +9221,7 @@ <h4 class="accordion-header" id="headingSolution9">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
+<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><div class="codewrapper sourceCode" id="cb43">
@@ -9509,7 +9511,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>Three levels.</li>
@@ -9757,7 +9759,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="codewrapper sourceCode" id="cb7">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -9818,7 +9820,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Here’s one solution.</p>
 <div class="codewrapper sourceCode" id="cb9">
@@ -10056,8 +10058,8 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2016-01-07",
-  "dateModified": "2023-06-06",
-  "datePublished": "2023-06-06"
+  "dateModified": "2023-06-07",
+  "datePublished": "2023-06-07"
 }
 
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diff --git a/design.html b/design.html
index a30e9977f..27f74e839 100644
--- a/design.html
+++ b/design.html
@@ -926,7 +926,7 @@ <h3 id="finish-1630">Finish (16:30)<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/design.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
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diff --git a/discuss.html b/discuss.html
index 5217ec44e..abc81e89d 100644
--- a/discuss.html
+++ b/discuss.html
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
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diff --git a/exercises.html b/exercises.html
index ec8e8fdc0..d1592e86f 100644
--- a/exercises.html
+++ b/exercises.html
@@ -433,7 +433,7 @@ <h1>Further Exercises</h1>
   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/exercises.html",
   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
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   </script><script>
diff --git a/images.html b/images.html
index cbdf47618..f6b70d2fe 100644
--- a/images.html
+++ b/images.html
@@ -611,8 +611,8 @@ <h3 id="09-plotting-figure-12">Figure 12</h3>
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   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/images.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2023-06-06",
-  "datePublished": "2023-06-06"
+  "dateModified": "2023-06-07",
+  "datePublished": "2023-06-07"
 }
 
   </script><script>
diff --git a/index.html b/index.html
index 4b770743f..053d61cb1 100644
--- a/index.html
+++ b/index.html
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   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/index.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2023-06-06",
-  "datePublished": "2023-06-06"
+  "dateModified": "2023-06-07",
+  "datePublished": "2023-06-07"
 }
 
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diff --git a/instructor-notes.html b/instructor-notes.html
index 937dd4dfa..e04620c1c 100644
--- a/instructor-notes.html
+++ b/instructor-notes.html
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   "identifier": "https://swcarpentry.github.io/python-novice-gapminder/instructor-notes.html",
   "dateCreated": "2016-01-07",
-  "dateModified": "2023-06-06",
-  "datePublished": "2023-06-06"
+  "dateModified": "2023-06-07",
+  "datePublished": "2023-06-07"
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diff --git a/instructor/01-run-quit.html b/instructor/01-run-quit.html
index 60b93de37..b6e3237f0 100644
--- a/instructor/01-run-quit.html
+++ b/instructor/01-run-quit.html
@@ -382,7 +382,7 @@ <h2 class="accordion-header" id="flush-headingTwelve">
       </div>
       <hr></nav><main id="main-content" class="main-content"><div class="container lesson-content">
         <h1>Running and Quitting</h1>
-        <p> Last updated on 2023-05-18 | 
+        <p> Last updated on 2023-06-07 | 
         
         <a href="https://github.com/swcarpentry/python-novice-gapminder/edit/main/episodes/01-run-quit.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
         
@@ -634,6 +634,8 @@ <h3 id="main-work-area">Main Work Area<a class="anchor" aria-label="anchor" href
 (notebooks, text files, etc.) and other activities (terminals, code
 consoles, etc.) into panels of tabs that can be resized or subdivided. A
 screenshot of the default Main Work Area is provided below.</p>
+<p>If you do not see the Launcher tab, click the blue plus sign under
+the “File” and “Edit” menus and it will appear.</p>
 <p align="center">
 <img alt="JupyterLab Main Work Area" src="../fig/0_jupyterlab_main_work_area.png" width="750" class="figure"></p>
 <p>Drag a tab to the center of a tab panel to move the tab to the panel.
@@ -718,7 +720,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>After creating the necessary tabs, you can drag one of the tabs to
 the center of a panel to move the tab to the panel; next you can
@@ -785,7 +787,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Command mode has a grey border and Edit mode has a blue border. Use
 <kbd>Esc</kbd> and <kbd>Return</kbd> to switch between modes. You need
@@ -949,7 +951,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This challenge integrates both the numbered list and bullet list.
 Note that the bullet list is indented 2 spaces so that it is inline with
@@ -992,7 +994,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Python returns the output of the last calculation.</p>
 <div class="codewrapper sourceCode" id="cb12">
@@ -1037,7 +1039,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>The Python code gets treated like Markdown text. The lines appear as
 if they are part of one contiguous paragraph. This could be useful to
@@ -1077,7 +1079,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>The notebook shows the equation as it would be rendered from LaTeX
 equation syntax. The dollar sign, <code>$</code>, is used to tell
@@ -1187,8 +1189,8 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2016-01-07",
-  "dateModified": "2023-05-18",
-  "datePublished": "2023-06-06"
+  "dateModified": "2023-06-07",
+  "datePublished": "2023-06-07"
 }
 
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diff --git a/instructor/02-variables.html b/instructor/02-variables.html
index 1e03fe5ab..a9fe246c4 100644
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   "dateCreated": "2016-01-07",
   "dateModified": "2023-05-02",
-  "datePublished": "2023-06-06"
+  "datePublished": "2023-06-07"
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diff --git a/instructor/03-types-conversion.html b/instructor/03-types-conversion.html
index 49738bb9d..94437dc51 100644
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@@ -653,7 +653,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>It is a floating-point number (often abbreviated “float”). It is
 possible to find out by using the built-in function
@@ -691,7 +691,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>It is a float: integers are automatically converted to floats as
 necessary.</p>
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 <figure><img src="../fig/9_correlations_solution2.png" alt="Correlations Solution 2" class="figure mx-auto d-block"></figure><p>Seems the variability in this value is due to a sharp drop after
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-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
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 <ol style="list-style-type: decimal"><li><p>The problem with the example is that the function
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 <ol style="list-style-type: decimal"><li><code>2003/2/1</code></li>
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 </button>
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-<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
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 <ol style="list-style-type: decimal"><li>The average GDP for Japan across the years reported for the 1980s is
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   </h4>
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 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li>Three levels.</li>
 <li><code>errors_02.py</code></li>
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 <hr>
-<p> Last updated on 2023-05-18 | 
+<p> Last updated on 2023-06-07 | 
         
         <a href="https://github.com/swcarpentry/python-novice-gapminder/edit/main/episodes/01-run-quit.md" class="external-link">Edit this page <i aria-hidden="true" data-feather="edit"></i></a></p>
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 (notebooks, text files, etc.) and other activities (terminals, code
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 <p>This challenge integrates both the numbered list and bullet list.
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 <p>The Python code gets treated like Markdown text. The lines appear as
 if they are part of one contiguous paragraph. This could be useful to
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-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
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 <p>The notebook shows the equation as it would be rendered from LaTeX
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 <p>It is a floating-point number (often abbreviated “float”). It is
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   </h4>
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-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
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 <p>It is a float: integers are automatically converted to floats as
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   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
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 <p>The answers to the questions are:</p>
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   </h4>
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+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We want the minimum number of surveys that reaches everyone once,
 which is the rounded up value of
@@ -2432,7 +2434,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>What do you expect this program to do? It would not be so
 unreasonable to expect the Python 3 <code>int</code> command to convert
@@ -2505,7 +2507,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Answer: 1 and 4</p>
 </div>
@@ -2554,7 +2556,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>Standard mathematics treatments typically use <code>i</code> to
@@ -2992,7 +2994,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>Order of operations:</li>
@@ -3042,7 +3044,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb30">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3110,7 +3112,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p><code>max</code> and <code>min</code> return TypeErrors in this case
 because the correct number of parameters was not supplied. If it just
@@ -3143,7 +3145,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p><code>name[len(name) - 1]</code></p>
 </div>
@@ -3446,7 +3448,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p>Using <code>help(math)</code> we see that we’ve got
@@ -3496,7 +3498,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>The <a href="https://docs.python.org/3/library/random.html" class="external-link">random
 module</a> seems like it could help.</p>
@@ -3578,7 +3580,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb15">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3620,7 +3622,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Importing the math module (<code>import math</code>)</p>
 </div>
@@ -3659,7 +3661,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb18">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3719,7 +3721,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li>Library calls 1 and 4. In order to directly refer to
@@ -3781,7 +3783,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb21">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3830,7 +3832,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5738,7 +5740,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb14">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5776,7 +5778,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb15">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5820,7 +5822,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <figure><img src="../fig/9_correlations_solution2.png" alt="Correlations Solution 2" class="figure mx-auto d-block"></figure><p>Seems the variability in this value is due to a sharp drop after
 1972. Some geopolitics at play perhaps? Given the dominance of oil
@@ -5860,7 +5862,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <figure><img src="../fig/9_more_correlations_solution.svg" alt="More Correlations Solution" class="figure mx-auto d-block"></figure><p>A good place to look is the documentation for the plot function -
 help(data_all.plot).</p>
@@ -6974,7 +6976,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>An IndentationError is a syntax error. Programs with syntax errors
 cannot be started. A program with a runtime error will start but an
@@ -7011,7 +7013,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <table class="table">
 <thead><tr class="header">
@@ -7082,7 +7084,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb18">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7126,7 +7128,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb20">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7168,7 +7170,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb22">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7211,7 +7213,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb24">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7250,7 +7252,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb25">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7296,7 +7298,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb27">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7352,7 +7354,7 @@ <h4 class="accordion-header" id="headingSolution9">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
+<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
 <div class="accordion-body">
 <ul>
 <li>Python variable names are case sensitive: <code>number</code> and
@@ -7409,7 +7411,7 @@ <h4 class="accordion-header" id="headingSolution10">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
+<div id="collapseSolution10" class="accordion-collapse collapse" data-bs-parent="#accordionSolution10" aria-labelledby="headingSolution10">
 <div class="accordion-body">
 <p>This list has 4 elements and the index to access the last element in
 the list is <code>3</code>.</p>
@@ -7838,7 +7840,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7887,7 +7889,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb22">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7935,7 +7937,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb24">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -7986,7 +7988,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb26">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8240,7 +8242,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>1 is not matched by the glob.</p>
 </div>
@@ -8281,7 +8283,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb10">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8324,7 +8326,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>This solution builds a useful legend by using the <a href="https://docs.python.org/3/library/stdtypes.html#str.split" class="external-link">string
 <code>split</code> method</a> to extract the <code>region</code> from
@@ -8687,7 +8689,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb16">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8728,7 +8730,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper">
 <h3 class="code-label">OUTPUT<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8805,7 +8807,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p>The problem with the example is that the function
@@ -8856,7 +8858,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb25">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8901,7 +8903,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb27">
 <h3 class="code-label">PYTHON<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -8967,7 +8969,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Show me the solution
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><code>2003/2/1</code></li>
@@ -9057,7 +9059,7 @@ <h4 class="accordion-header" id="headingSolution7">
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   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
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-  "datePublished": "2023-06-06"
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index bfa48bfde..c67ac4822 100644
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index 0ae7488f6..faef73e6a 100644
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index cb03ba71f..cd3ffa214 100644
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index 84fbb7fb8..f40769466 100644
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