C12313211232233312111111312111133133313331333132232233122221223131   >>    C1231321123223331211111131211113313331333133313223223312222122313   <<    C12313211232233312111111312111133133313331333132232233122221223133   >>      C12313211232233312111111312111133133313331333132232233122221223132   >>