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