Consider the following premises. forall x_14: ~R_14(x_14). R_14(a_14) or t. q. Can we infer ~t from them? If possible, name the inference rules being used at each step.
 From forall x_14: ~R_14(x_14) we can infer ~R_14(a_14) via universal instantiation. Finally, from R_14(a_14) or t, ~R_14(a_14) we can infer t via disjunctive syllogism, which contradicts ~t. Therefore, the answer is no.