C12313211232233312111111312111133133313223332233131123323322211   >>    C1231321123223331211111131211113313331322333223313112332332221   <<    C12313211232233312111111312111133133313223332233131123323322213   >>      C12313211232233312111111312111133133313223332233131123323322212   >>