4 4 8

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

0       7       4       3
3       4       7       0
5       2       1       6
6       1       2       5

I don't remember how I generated this one...
it is a bit better than awgn2o3_4_msb and worse
than awgn2o3_4_msbG.
