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_4: P(y_4) -> S_1(y_4). forall y_4: T_3(y_4) or P(y_4). exists y_4: S_1(y_4) or ~T_3(y_4).
exists y_4: T_3(y_4) -> S_1(y_4) can be inferred via the existential rewriting rule.