C12313211232233312111111312111133133313331323133313332322321233223322121   >>    C1231321123223331211111131211113313331333132313331333232232123322332212   <<    C12313211232233312111111312111133133313331323133313332322321233223322123   >>      C12313211232233312111111312111133133313331323133313332322321233223322122   >>