C12313211232233312111111312111133133313331333132232233122311221123111   >>    C1231321123223331211111131211113313331333133313223223312231122112311   <<    C12313211232233312111111312111133133313331333132232233122311221123113   >>      C12313211232233312111111312111133133313331333132232233122311221123112   >>