C12313211232233312111111312111133133313331323133313331122332321121113233232211   >>    C1231321123223331211111131211113313331333132313331333112233232112111323323221   <<    C12313211232233312111111312111133133313331323133313331122332321121113233232213   >>      C12313211232233312111111312111133133313331323133313331122332321121113233232212   >>