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retainAll

Platform and version requirements:
fun retainAll(elements: Collection<E>): Boolean

Overrides MutableSet.retainAll

Retains only the elements in this collection that are contained in the specified collection.

Return true if any element was removed from the collection, false if the collection was not modified.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-linked-hash-set/retain-all.html