C12313211232233312111111312111133133313331323133313331213331121213313133232211   >>    C1231321123223331211111131211113313331333132313331333121333112121331313323221   <<    C12313211232233312111111312111133133313331323133313331213331121213313133232213   >>      C12313211232233312111111312111133133313331323133313331213331121213313133232212   >>