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