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addAll

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

Overrides MutableSet.addAll

Adds all of the elements of the specified collection to this collection.

Return true if any of the specified elements was added to 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/-abstract-mutable-set/add-all.html