What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Karen is listening to a song or Mary is not a sailor. It is windy if and only if Thomas is climbing a mountain. If Barbara were a mechanic, then it is windy. If Thomas climbs a mountain, then Mary is a sailor.
If Mary were a sailor, then Karen is listening to a song. If it is windy, then Thomas is climbing a mountain. If Thomas climbs a mountain, then it is windy.