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: exists x_12: T(x_12) -> ~Q_3(x_12). forall x_12: Q_3(x_12). forall x_12: T(x_12) <-> S(x_12).
exists x_12: ~T(x_12) can be inferred via the existential modus tollens rule. forall x_12: T(x_12) -> S(x_12) can be inferred via the universal biconditional elimination rule. forall x_12: S(x_12) -> T(x_12) can be inferred via the universal biconditional elimination rule.