What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Karen is climbing a mountain or Thomas is not rich. Karen is climbing a mountain if and only if Thomas is rich. Thomas is not rich.
If Thomas were rich, then Karen is climbing a mountain. If Karen climbs a mountain, then Thomas is rich. If Thomas were rich, then Karen is climbing a mountain. Karen is not climbing a mountain.