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