Consider the following premises. p <-> R(a_14). forall x_2: R(x_2) -> S(x_2). forall x_2: ~S(x_2). Can we infer ~p or t from them? If possible, name the inference rules being used at each step.
 From forall x_2: R(x_2) -> S(x_2), forall x_2: ~S(x_2) we can infer forall x_2: ~R(x_2) via universal modus tollens. From forall x_2: ~R(x_2) we can infer ~R(a_14) via universal instantiation. From p <-> R(a_14), ~R(a_14) we can infer ~p via biconditional elimination. Finally, from ~p we can infer ~p or t via addition. Therefore, the answer is yes.