C12313211232233312111111312111133133313331323133313332322331212221223213313211   >>    C1231321123223331211111131211113313331333132313331333232233121222122321331321   <<    C12313211232233312111111312111133133313331323133313332322331212221223213313213   >>      C12313211232233312111111312111133133313331323133313332322331212221223213313212   >>