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