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Collection types such as HashSet, BTreeSet, and BinaryHeap enable us to access their values as a reference, mutable (modifiable) reference, or just a value with the Into Iterator implementation. The value returned in the 3rd option is deleted from the collection.
To understand iterators in more detail, additional resource can be found here:
https://www.youtube.com/watch?v=sjq_0qCCQm0
You can find further information from Rust documentation in here:
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