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fun main() { val x = 4 val y = 15 val lst = listOf(5, 5, 5, 5, 6, 7, 9, 10, 10, 10, 11, 13) val missingValues = (x..y).toSet().subtract(lst.toSet()) println("missingValues: $missingValues") } /* run: missingValues: [4, 8, 12, 14, 15] */