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3 changes: 2 additions & 1 deletion book/variables.md
Original file line number Diff line number Diff line change
Expand Up @@ -63,7 +63,8 @@ There are a couple of assignment operators used with mutable variables

1. `+=`, `-=`, `*=` and `/=` are only valid in the contexts where their root operations are expected to work. For example, `+=` uses addition, so it can not be used for contexts where addition would normally fail
2. `++=` requires that either the variable **or** the argument is a list.
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#### More on Mutability

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