C11111211113313112113313331333133313133313232233133313232212111211   >>    C1111121111331311211331333133313331313331323223313331323221211121   <<    C11111211113313112113313331333133313133313232233133313232212111213   >>      C11111211113313112113313331333133313133313232233133313232212111212   >>