C12313211232233312111111312111133133313331323133313332322331212221133223311   >>    C1231321123223331211111131211113313331333132313331333232233121222113322331   <<    C12313211232233312111111312111133133313331323133313332322331212221133223313   >>      C12313211232233312111111312111133133313331323133313332322331212221133223312   >>