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