The third realization is based on a trellis that describes the code:
The order of the bits have been changed according to the following new generator matrix:
|   1 0   1 0 1 1   0 0   | |
G' |
|   0 0   1 1 1 0   1 0   | |
|   0 0   1 1 0 1   0 1   | |
One gets the following realization: