C12313211232233312111111312111133133313331323133313331122332321123122121311   >>    C1231321123223331211111131211113313331333132313331333112233232112312212131   <<    C12313211232233312111111312111133133313331323133313331122332321123122121313   >>      C12313211232233312111111312111133133313331323133313331122332321123122121312   >>