fun <T> Sequence<T>.filterIndexed( predicate: (index: Int, T) -> Boolean ): Sequence<T>
Returns a sequence containing only elements matching the given predicate.
predicate - function that takes the index of an element and the element itself and returns the result of predicate evaluation on the element.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.sequences/filter-indexed.html