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 y: Q(y) -> U_3(y). forall y: U_3(y) -> T_1(y). forall y: T_1(y) -> P_4(y). forall y: ~P_4(y).
forall y: ~T_1(y) can be inferred via the universal modus tollens rule. forall y: U_3(y) -> P_4(y) can be inferred via the universal transitivity rule. exists y: Q(y) -> T_1(y) can be inferred via the existential transitivity rule.