C11111211113313112113313331333133313133313232233133313121133221   >>    C1111121111331311211331333133313331313331323223313331312113322   <<    C11111211113313112113313331333133313133313232233133313121133223   >>      C11111211113313112113313331333133313133313232233133313121133222   >>