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_6: W_4(x_6) -> Q_6(x_6). forall x_6: W_4(x_6) -> Q_5(x_6). forall x_6: W_4(x_6) <-> Q_5(x_6). forall x_6: ~Q_6(x_6).
forall x_6: ~W_4(x_6) can be inferred via the universal modus tollens rule. forall x_6: W_4(x_6) -> Q_5(x_6) can be inferred via the universal biconditional elimination rule. forall x_6: Q_5(x_6) -> W_4(x_6) can be inferred via the universal biconditional elimination rule.