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_6: U(x_6) <-> T(x_6). forall x_6: T_1(x_6) -> ~Q_6(x_6). forall x_6: Q_6(x_6). forall x_6: T(x_6) -> T_1(x_6).
forall x_6: ~T_1(x_6) can be inferred via the universal modus tollens rule. exists x_6: U(x_6) -> T(x_6) can be inferred via the existential biconditional elimination rule. exists x_6: T(x_6) -> U(x_6) can be inferred via the existential biconditional elimination rule.