查找生成矩阵中的四、六、八、十、十二环，不含一些重复的，比如两个四环可以被假定的八环，两个六环假定的十二环等。-Find generator matrix of the four, six, eight, ten, ten bicyclic, do not contain some repetitive, such as two fourth can be assumed eight ring, two six ring assumed ten bicyclic, etc.