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