Consider the following premises. p_7 <-> p. t_1. ~p_7. Can we infer ~p and t_1 from them? If possible, name the inference rules being used at each step.
 From p_7 <-> p, ~p_7 we can infer ~p via biconditional elimination. Finally, from ~p, t_1 we can infer ~p and t_1 via conjunction. Therefore, the answer is yes.