C12313211232233312111111312111133133313331323133313331122332321121122223121   >>    C1231321123223331211111131211113313331333132313331333112233232112112222312   <<    C12313211232233312111111312111133133313331323133313331122332321121122223123   >>      C12313211232233312111111312111133133313331323133313331122332321121122223122   >>