C12313211232233312111111312111133133313331323133313333232233323222233132211   >>    C1231321123223331211111131211113313331333132313331333323223332322223313221   <<    C12313211232233312111111312111133133313331323133313333232233323222233132213   >>      C12313211232233312111111312111133133313331323133313333232233323222233132212   >>