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_5: ~Q_4(x_5). forall x_5: U_3(x_5) <-> Q_4(x_5). forall x_5: S(x_5) -> U_3(x_5). forall x_5: U_3(x_5) -> S(x_5).
forall x_5: S(x_5) <-> U_3(x_5) can be inferred via the universal biconditional introduction rule. forall x_5: U_3(x_5) <-> S(x_5) can be inferred via the universal biconditional introduction rule. forall x_5: U_3(x_5) -> Q_4(x_5) can be inferred via the universal biconditional elimination rule. forall x_5: Q_4(x_5) -> U_3(x_5) can be inferred via the universal biconditional elimination rule. forall x_5: ~U_3(x_5) can be inferred via the universal biconditional elimination rule.