C12313211232233312111111312111133133313331323133313331213333213213223311   >>    C1231321123223331211111131211113313331333132313331333121333321321322331   <<    C12313211232233312111111312111133133313331323133313331213333213213223313   >>      C12313211232233312111111312111133133313331323133313331213333213213223312   >>