C12313211232233312111111312111133133313331323133313332322331212222233123231   >>    C1231321123223331211111131211113313331333132313331333232233121222223312323   <<    C12313211232233312111111312111133133313331323133313332322331212222233123233   >>      C12313211232233312111111312111133133313331323133313332322331212222233123232   >>