4 4 8

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

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

This is the rate 2/3 Ungerboeck's code with 4 states. 
The states are defined in typical way. 

d_free^2=4 Es -> 3.0 dB over uncoded QPSK 

Parity check matrix in octal: [0 2 5]

Generator matrix:

[1	0	0
 0	1+D^2	D]
