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 x_7: R_2(x_7) <-> Q_4(x_7). forall x_7: Q_4(x_7) or ~W_3(x_7). forall x_7: W_3(x_7) or R_2(x_7).
forall x_7: W_3(x_7) -> Q_4(x_7) can be inferred via the universal rewriting rule. forall x_7: R_2(x_7) -> Q_4(x_7) can be inferred via the universal biconditional elimination rule. forall x_7: Q_4(x_7) -> R_2(x_7) can be inferred via the universal biconditional elimination rule.