What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~S_15(j). Q(j) <-> S_20(a_20). forall x_20: R_20(x_20) -> S_20(x_20). forall x_15: Q(x_15) -> S_15(x_15).
Q(j) -> S_20(a_20). S_20(a_20) -> Q(j).