What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Linda were an astronaut, then Patricia is a doctor. If Linda were an astronaut, then Patricia is a doctor. If Patricia were a doctor, then Linda is an astronaut.
Linda is an astronaut if and only if Patricia is a doctor. Linda is an astronaut if and only if Patricia is a doctor. Patricia is a doctor if and only if Linda is an astronaut. Patricia is a doctor if and only if Linda is an astronaut.