What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Susan were a nurse, then Michael is climbing a mountain. If Robert drives a car, then Susan is a nurse. It is raining or Robert is driving a car. It is raining if and only if Susan is a nurse.
If Robert drives a car, then Michael is climbing a mountain. If it rains, then Susan is a nurse. If Susan were a nurse, then it is raining.