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_3: Q_13(y_3) -> W(y_3). forall x_13: Q_10(x_13) -> Q_13(x_13). forall x_13: P_13(x_13) <-> Q_13(x_13). forall x_13: P_13(x_13) or Q_10(x_13).
forall x_13: P_13(x_13) -> Q_13(x_13) can be inferred via the universal biconditional elimination rule. forall x_13: Q_13(x_13) -> P_13(x_13) can be inferred via the universal biconditional elimination rule.