What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_15: R_15(x_15) -> S_15(x_15). ~q. q <-> q_8. S_15(a_15) <-> q_8.
q -> q_8. S_15(a_15) -> q_8. q_8 -> q. q_8 -> S_15(a_15). ~q_8.