What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_14, x_14 is not a writer. If Linda were not a nurse, then William is an astronaut. Linda is a nurse if and only if Jessica is a writer.
If Linda were a nurse, then Jessica is a writer can be inferred via the biconditional elimination rule. If Jessica were a writer, then Linda is a nurse can be inferred via the biconditional elimination rule.