//{1, 0, 0, 0, 0, 0, 2, 3, 0, 0, 0, 0, 4, 5, 6};
constexpr short q4[4][3][2] = { 1,[1] = 2, 3,[2] = 4, 5, 6 };
static_assert(q4[0][0][0] == 1);
static_assert(q4[1][0][0] == 2);
static_assert(q4[1][0][1] == 3);
static_assert(q4[2][0][0] == 4);
static_assert(q4[2][0][1] == 5);
static_assert(q4[2][1][0] == 6);