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