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