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_10: Q_10(x_10). forall x_10: U(x_10) -> ~Q_10(x_10). exists x_10: U_3(x_10) -> U(x_10). forall x_10: W_4(x_10) <-> U_3(x_10).
forall x_10: ~U(x_10) can be inferred via the universal modus tollens rule. forall x_10: W_4(x_10) -> U_3(x_10) can be inferred via the universal biconditional elimination rule. forall x_10: U_3(x_10) -> W_4(x_10) can be inferred via the universal biconditional elimination rule.