Consider the following premises. ~u. u or q_6. forall x_2: S(x_2). Can we infer ~q_6 from them? If possible, name the inference rules being used at each step.
 From forall x_2: S(x_2) we can infer S(h) via universal instantiation. Finally, from u or q_6, ~u we can infer q_6 via disjunctive syllogism, which contradicts ~q_6. Therefore, the answer is no.