fun <T> Sequence<T>.toMutableSet(): MutableSet<T>
Returns a mutable set containing all distinct elements from the given sequence.
The returned set preserves the element iteration order of the original sequence.
The operation is terminal.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/to-mutable-set.html