C12313211232233312111111312111133133313223332233132133313233211   >>    C1231321123223331211111131211113313331322333223313213331323321   <<    C12313211232233312111111312111133133313223332233132133313233213   >>      C12313211232233312111111312111133133313223332233132133313233212   >>