KotlinFlowPlay.kt

    public override fun play(): List<Map.Entry<Int, List<String>>> {
        val scoreOfALetter = { letter: Int -> flowOf(letterScores[letter - 'a'.toInt()]) }

        val letterScore = { entry: Map.Entry<Int, LongWrapper> ->
            flowOf(
                letterScores[entry.key - 'a'.toInt()] * Integer.min(
                    entry.value.get().toInt(),
                    scrabbleAvailableLetters[entry.key - 'a'.toInt()]
                )
            )
        }