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: forall y_4: W(y_4) <-> Q_4(y_4). exists y_4: Q_4(y_4) -> W(y_4).
forall y_4: W(y_4) -> Q_4(y_4) can be inferred via the universal biconditional elimination rule. forall y_4: Q_4(y_4) -> W(y_4) can be inferred via the universal biconditional elimination rule.