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