C12313211232233312111111312111133133313331333132232233122311232123211   >>    C1231321123223331211111131211113313331333133313223223312231123212321   <<    C12313211232233312111111312111133133313331333132232233122311232123213   >>      C12313211232233312111111312111133133313331333132232233122311232123212   >>