What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~r_4. forall x_17: R_17(x_17) -> S_17(x_17). R_17(a_17) or ~S_17(a_17). r_4 <-> S_17(a_17).
S_17(a_17) -> R_17(a_17). r_4 -> S_17(a_17). S_17(a_17) -> r_4. ~S_17(a_17).