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