C12313211232233312111111312111133133313331323133313332322331212222123223112131   >>    C1231321123223331211111131211113313331333132313331333232233121222212322311213   <<    C12313211232233312111111312111133133313331323133313332322331212222123223112133   >>      C12313211232233312111111312111133133313331323133313332322331212222123223112132   >>