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flatMapTo

inline fun <T, R, C : MutableCollection<in R>> Sequence<T>.flatMapTo(
    destination: C, 
    transform: (T) -> Sequence<R>
): C

Appends all elements yielded from results of transform function being invoked on each element of original sequence, to the given destination.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/flat-map-to.html