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: U(x_10) -> Q_10(x_10). forall x_10: Q_10(x_10) -> U(x_10). forall x_10: Q_10(x_10) -> U(x_10). forall x_10: U(x_10) <-> S_4(x_10). forall x_10: ~Q_10(x_10).
forall x_10: ~U(x_10) can be inferred via the universal modus tollens rule. forall x_10: U(x_10) <-> Q_10(x_10) can be inferred via the universal biconditional introduction rule. forall x_10: U(x_10) <-> Q_10(x_10) can be inferred via the universal biconditional introduction rule. forall x_10: Q_10(x_10) <-> U(x_10) can be inferred via the universal biconditional introduction rule. forall x_10: Q_10(x_10) <-> U(x_10) can be inferred via the universal biconditional introduction rule. forall x_10: U(x_10) -> S_4(x_10) can be inferred via the universal biconditional elimination rule. forall x_10: S_4(x_10) -> U(x_10) can be inferred via the universal biconditional elimination rule.