4 4 16 

0   2   1   3
0   2   1   3
0   2   1   3
0   2   1   3

 0  3 13 14
12 15  1  2
 7  4 10  9
11  8  6  5

generated by the awgn1o2_4.fsm code
(two steps of the 1o2 code)