What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it rains, then Karen is a mechanic. If Karen were a mechanic, then it is raining. Mary is an artist if and only if Karen is a mechanic.
It is raining if and only if Karen is a mechanic. Karen is a mechanic if and only if it is raining. If Mary were an artist, then Karen is a mechanic. If Karen were a mechanic, then Mary is an artist.