What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Susan is a doctor if and only if it is windy. If Jessica takes a plane, then Susan is a doctor. It is sunny or it is windy. It is not sunny or Jessica is taking a plane.
It is windy or Jessica is taking a plane. If Susan were a doctor, then it is windy. If it is windy, then Susan is a doctor.