fun <T, R> Sequence<T>.flatMap( transform: (T) -> Sequence<R> ): Sequence<R>
Returns a single sequence of all elements from results of transform function being invoked on each element of original sequence.
The operation is intermediate and stateless.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/flat-map.html