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asp_program += "delivery_point_demand(T+1,delivery_point_idx,Demand-1) :- delivery_point_demand(T,delivery_point_idx,Demand), delivery_point(delivery_point_idx),time(T), Demand>0. \n" asp_program += "delivery_point_demand(T+1,delivery_point_idx,Demand) :- delivery_point_demand(T,delivery_point_idx,Demand), delivery_point(delivery_point_idx),time(T), Demand=0.\n"