C12313211232233312111111312111133133313331323133313331213331121213313232122221   >>    C1231321123223331211111131211113313331333132313331333121333112121331323212222   <<    C12313211232233312111111312111133133313331323133313331213331121213313232122223   >>      C12313211232233312111111312111133133313331323133313331213331121213313232122222   >>