What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If John climbs a mountain, then Sarah is a mechanic. If it rains, then it is not overcast. If it rains, then Sarah is a mechanic. If Sarah were a mechanic, then it is raining. It is overcast.
It is not raining. If John climbs a mountain, then it is raining. If Sarah were a mechanic, then it is not overcast. It is raining if and only if Sarah is a mechanic. Sarah is a mechanic if and only if it is raining.