2 8 4

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


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


1/2 8-state code (Proakis pg. 493)
GM1o2_8=[ 1+D+D^3   1+D+D^2+D^3] =[13 , 15] (decimal)