C313212111133131211331333133313331333133311233133313113313232223221   >>    C31321211113313121133133313331333133313331123313331311331323222322   <<    C313212111133131211331333133313331333133311233133313113313232223223   >>      C313212111133131211331333133313331333133311233133313113313232223222   >>