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: u_4. forall x_14: R_14(x_14) -> S_14(x_14). R_14(a_14).
u_4 and R_14(a_14) can be inferred via the conjunction rule. R_14(a_14) and u_4 can be inferred via the conjunction rule. exists x: R_14(x) can be inferred via the existential generalization rule.