C12313211232233312111111312111133133313331323133313332322331212222121312211   >>    C1231321123223331211111131211113313331333132313331333232233121222212131221   <<    C12313211232233312111111312111133133313331323133313332322331212222121312213   >>      C12313211232233312111111312111133133313331323133313332322331212222121312212   >>