Consider the following premises. p_3 <-> q_19. p_3 or ~q_19. ~q_19. Can we infer ~p_3 or p from them?
 From p_3 <-> q_19 we can infer p_3 -> q_19. From p_3 or ~q_19 we can infer q_19 -> p_3. From p_3 -> q_19, q_19 -> p_3 we can infer p_3 <-> q_19. From p_3 <-> q_19, ~q_19 we can infer ~p_3. Finally, from ~p_3 we can infer ~p_3 or p. Therefore, the answer is yes.