Consider the following premises. p_7 -> ~s_3. p_7 <-> q_3. s_3. p <-> q_3. Can we infer p from them?
 From p_7 -> ~s_3, s_3 we can infer ~p_7. From p_7 <-> q_3, ~p_7 we can infer ~q_3. Finally, from p <-> q_3, ~q_3 we can infer ~p, which contradicts p. Therefore, the answer is no.