What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Barbara were happy, then Thomas is a cashier. If Linda were a nurse, then Jessica is not a soldier. Jessica is a soldier. Linda is a nurse if and only if Thomas is a cashier.
Linda is not a nurse. If Linda were a nurse, then Thomas is a cashier. If Thomas were a cashier, then Linda is a nurse.