C11111211113313112113313331333133313133313232233133313232233112113313211   >>    C1111121111331311211331333133313331313331323223313331323223311211331321   <<    C11111211113313112113313331333133313133313232233133313232233112113313213   >>      C11111211113313112113313331333133313133313232233133313232233112113313212   >>