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4 4 16
0 1 2 3
0 1 2 3
0 1 2 3
0 1 2 3
0 13 3 14
12 1 15 2
7 10 4 9
11 6 8 5
This is generated by the 1/2 AWGN code (5 7) operated twice, ie,
(xk+1 xki) [xk-1 xk-2] -> [xk+1 xki].
intermediate states:
00 21 02 23
00 21 02 23
10 31 12 33
10 31 12 33
output:
00 31 03 32
30 01 33 02
13 22 10 21
23 12 20 11
and in decimal:
0 13 3 14
12 1 15 2
7 10 4 9
11 6 8 5
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