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