What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? p <-> q_16. ~p. p_7 <-> s_1. ~p_7.
~p and ~p_7. ~p_7 and ~p. p -> q_16. p_7 -> s_1. q_16 -> p. s_1 -> p_7. ~q_16. ~s_1.