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: R(y) or ~U_3(y). forall y: U_3(y) or S_2(y). exists y: R(y) or ~S_2(y).
forall y: U_3(y) -> R(y) can be inferred via the universal rewriting rule. exists y: S_2(y) -> R(y) can be inferred via the existential rewriting rule.