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_1: ~Q_1(x_1). exists x_1: T_2(x_1) -> Q_1(x_1). forall x_1: T_2(x_1) <-> Q(x_1).
exists x_1: ~T_2(x_1) can be inferred via the existential modus tollens rule. forall x_1: T_2(x_1) -> Q(x_1) can be inferred via the universal biconditional elimination rule. forall x_1: Q(x_1) -> T_2(x_1) can be inferred via the universal biconditional elimination rule.