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Replace 'which'. #2663

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Replace 'which'. #2663

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6 changes: 3 additions & 3 deletions src/ch15-04-rc.md
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Expand Up @@ -9,9 +9,9 @@ edges pointing to it.

To enable multiple ownership, Rust has a type called `Rc<T>`, which is an
abbreviation for *reference counting*. The `Rc<T>` type keeps track of the
number of references to a value which determines whether or not a value is
still in use. If there are zero references to a value, the value can be cleaned
up without any references becoming invalid.
number of references to a value to determine whether or not the value is still
in use. If there are zero references to a value, the value can be cleaned up
without any references becoming invalid.

Imagine `Rc<T>` as a TV in a family room. When one person enters to watch TV,
they turn it on. Others can come into the room and watch the TV. When the last
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