What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Susan is driving a car and Elisabeth is taking a plane. If Linda were a server, then Susan is not driving a car. Barbara is a writer if and only if Linda is a server.
Susan is driving a car. Elisabeth is taking a plane. If Barbara were a writer, then Linda is a server. If Linda were a server, then Barbara is a writer.