Consider the following premises. p_4 <-> ~p_8. forall z: T_3(z). p_8 -> ~T_3(j_2). Can we infer p_4 from them?
 From forall z: T_3(z) we can infer T_3(j_2). From p_8 -> ~T_3(j_2), T_3(j_2) we can infer ~p_8. From p_4 <-> ~p_8 we can infer ~p_8 -> p_4. Finally, from ~p_8 -> p_4, ~p_8 we can infer p_4. Therefore, the answer is yes.