What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? w_4 -> p_13. ~p. p_13 <-> w_4. p_13 -> p. p -> p_13.
~p_13. w_4 -> p. p_13 <-> p. p <-> p_13. p_13 -> w_4. w_4 -> p_13.