diff --git a/tutorial/tutex/4.10.txt b/tutorial/tutex/4.10.txt
new file mode 100644
index 00000000..535b8ca5
--- /dev/null
+++ b/tutorial/tutex/4.10.txt
@@ -0,0 +1,2 @@
+gap> file:=HapFile("data1V2X.pdb");;
+gap> DisplayPDBfile(file);
diff --git a/tutorial/tutex/4.11.txt b/tutorial/tutex/4.11.txt
new file mode 100644
index 00000000..1ae5fa4c
--- /dev/null
+++ b/tutorial/tutex/4.11.txt
@@ -0,0 +1,7 @@
+gap> r:=5;;
+gap> K:=ReadPDBfileAsPureCubicalComplex(file,r);;      
+gap> K:=ContractedComplex(K);;
+gap> K!.properties;
+[ [ "dimension", 3 ], [ "arraySize", [ 184, 186, 294 ] ] ]
+
+gap> Display(K);
diff --git a/tutorial/tutex/4.12.txt b/tutorial/tutex/4.12.txt
new file mode 100644
index 00000000..3573420c
--- /dev/null
+++ b/tutorial/tutex/4.12.txt
@@ -0,0 +1,5 @@
+gap> F:=ThickeningFiltration(K,15);;
+gap> F:=FilteredPureCubicalComplexToCubicalComplex(F);;
+gap> F:=FilteredCubicalComplexToFilteredRegularCWComplex(F);;
+gap> P:=PersistentBettiNumbersAlt(F,1);;
+gap> BarCodeCompactDisplay(P);
diff --git a/tutorial/tutex/4.13.txt b/tutorial/tutex/4.13.txt
new file mode 100644
index 00000000..5bf205f5
--- /dev/null
+++ b/tutorial/tutex/4.13.txt
@@ -0,0 +1,10 @@
+gap> C:=PureComplexComplement(K);;
+gap> C:=ContractedComplex(C);;
+gap> G:=FundamentalGroup(C);;
+gap> GeneratorsOfGroup(G);
+[ f1, f2 ]
+gap> RelatorsOfFpGroup(G);
+[ f2*f1^-1*f2^-1*f1^-1*f2*f1 ]
+
+gap> AlexanderPolynomial(G);
+x_1^2-x_1+1