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: q_1. p_4 or S(a). p_4 -> S_16(a). forall x_16: S(x_16) -> S_16(x_16).
R_1(a) -> p_4 can be inferred via the rewriting rule.