val items = listOf("xyzw", "rgba", "stpq").map { it.toCharArray() }


val map = mutableMapOf<Int, MutableSet<List<Int>>>()

for (firstChar in 0..3) {
    for (secondChar in 0..3) {
        val char2 = listOf(firstChar, secondChar)
        map.getOrPut(char2.max()!!, ::mutableSetOf).add(char2)

        for (thirdChar in 0..3) {
            val char3 = listOf(firstChar, secondChar, thirdChar)
            map.getOrPut(char3.max()!!, ::mutableSetOf)
                .add(char3)

            for (fourth in 0..3) {
                val char4 = listOf(firstChar, secondChar, thirdChar, fourth)
                map.getOrPut(char4.max()!!, ::mutableSetOf)
                    .add(char4)
            }
        }
    }
}

for ((dim, nrs) in map) {
    if (dim != 1) {
        println("Vec${maxOf(dim + 1, 2)} ->")
    }

    for (item in nrs) {

        for (set in items) {
            println(
                "    val ${item.map(set::get).joinToString("")}\n        get() = KVec${item.size}(${item.map(items[0]::get)
                    .joinToString(",")})\n"
            )
        }
    }
}