/* Gas: NOT-P <note: doesn't work b/c the DDE doesn't seem to apply> */directly_causes(produce_medicine, medicine_available).directly_causes(produce_medicine, produce_gas).directly_causes(medicine_available, cure_5_patients).directly_prevents(cure_5_patients, killing(5)).directly_causes(produce_gas, killing(1)).is_goal(prevention_of(killing(5))).