C12313211232233312111111312111133133313331333132232233122131323211   >>    C1231321123223331211111131211113313331333133313223223312213132321   <<    C12313211232233312111111312111133133313331333132232233122131323213   >>      C12313211232233312111111312111133133313331333132232233122131323212   >>