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 y_1: ~Q_4(y_1). exists y_1: T_3(y_1) -> Q_4(y_1). forall y_1: T_3(y_1) <-> S(y_1).
exists y_1: ~T_3(y_1) can be inferred via the existential modus tollens rule. forall y_1: T_3(y_1) -> S(y_1) can be inferred via the universal biconditional elimination rule. forall y_1: S(y_1) -> T_3(y_1) can be inferred via the universal biconditional elimination rule.