What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_25: R_25(x_25) -> S_25(x_25). r_4. R_25(a_25).
r_4 and R_25(a_25). R_25(a_25) and r_4. exists x: R_25(x).