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