C12313211232233312111111312111133133313331323133313331213331121213313231212221   >>    C1231321123223331211111131211113313331333132313331333121333112121331323121222   <<    C12313211232233312111111312111133133313331323133313331213331121213313231212223   >>      C12313211232233312111111312111133133313331323133313331213331121213313231212222   >>