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 Joseph is a doctor. It is not windy. If Joseph were a doctor, then it is windy. It is cold if and only if it is raining.
Joseph is not a doctor. If it rains, then it is windy. If it is cold, then it is raining. If it rains, then it is cold.