C12313211232233312111111312111133133313331323133313331122332321223233111221   >>    C1231321123223331211111131211113313331333132313331333112233232122323311122   <<    C12313211232233312111111312111133133313331323133313331122332321223233111223   >>      C12313211232233312111111312111133133313331323133313331122332321223233111222   >>