fun <T> Sequence<Sequence<T>>.flatten(): Sequence<T>
Returns a sequence of all elements from all sequences in this sequence.
@JvmName("flattenSequenceOfIterable") fun <T> Sequence<Iterable<T>>.flatten(): Sequence<T> Returns a sequence of all elements from all iterables in this sequence.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/flatten.html