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fun <T,R> unfoldRight(f: (T) -> Pair<R, T>?, b: T): List<R> {
    val maybePair: Pair<R, T>? = f(b)
    return if ( maybePair == null) {
        listOf()
    } else {
        listOf(maybePair.first) + unfoldRight(f, maybePair.second)
    }
}