layout = array2d(1..17,1..3, [ 28, 30, 11, 2, 48, 20, 29, 44, 9, 45, 47, 40, 24, 10, 19, 14, 15, 51, 5, 43, 46, 8, 18, 32, 37, 22, 36, 31, 50, 49, 7, 12, 52, 27, 4, 39, 33, 23, 38, 25, 41, 35, 42, 17, 3, 34, 13, 26, 21, 6, 16 ]);