C313212111133131211331333133313331333133311233133313113313232312121   >>    C31321211113313121133133313331333133313331123313331311331323231212   <<    C313212111133131211331333133313331333133311233133313113313232312123   >>      C313212111133131211331333133313331333133311233133313113313232312122   >>