What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is raining or Patricia is taking a plane. If Patricia takes a plane, then it is cold. If it is cold, then Karen is making tea. It is cold if and only if it is raining.
If Patricia takes a plane, then Karen is making tea. If it is cold, then it is raining. If it rains, then it is cold.