Consider the following premises. U(a_8) -> p_1. S(a_8) <-> p_1. forall z: P(z) or U(z). forall z: ~P(z) or S(z). Can we infer p_1 from them?
 From forall z: P(z) or U(z), forall z: ~P(z) or S(z) we can infer forall z: U(z) or S(z). From forall z: U(z) or S(z) we can infer U(a_8) or S(a_8). From S(a_8) <-> p_1 we can infer S(a_8) -> p_1. Finally, from U(a_8) -> p_1, S(a_8) -> p_1, U(a_8) or S(a_8) we can infer p_1. Therefore, the answer is yes.