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