What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: It is cloudy. William is not drinking water. William is drinking water or it is snowing. If it is cloudy, then Patricia is a nurse.
Patricia is a nurse can be inferred via the modus ponens rule. It is snowing can be inferred via the disjunctive syllogism rule. It is cloudy and William is not drinking water can be inferred via the conjunction rule. William is not drinking water and it is cloudy can be inferred via the conjunction rule.