Delete duplicated sentence.
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@ -175,9 +175,6 @@ we called `add_num`, it mutated the underlying value, as we'd expect. We also
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needed to declare `add_num` as `mut` too, because we’re mutating its
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environment.
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We also had to declare `add_num` as mut, since we will be modifying its
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environment.
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If we change to a `move` closure, it's different:
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```rust
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