C12313211232233312111111312111133133313331323133313331122332321232122211   >>    C1231321123223331211111131211113313331333132313331333112233232123212221   <<    C12313211232233312111111312111133133313331323133313331122332321232122213   >>      C12313211232233312111111312111133133313331323133313331122332321232122212   >>