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