C11111211113313112113313331333133313133313232233133313232223322121   >>    C1111121111331311211331333133313331313331323223313331323222332212   <<    C11111211113313112113313331333133313133313232233133313232223322123   >>      C11111211113313112113313331333133313133313232233133313232223322122   >>