What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? r_4 -> w_1. ~p. q_8 -> r_4. w_1 -> q_8. p <-> w_1.
r_4 -> q_8. q_8 -> w_1. w_1 -> r_4. p -> w_1. w_1 -> p. ~w_1.