Consider the following premises. r_3 <-> w. w or t. q_2 <-> r_3. ~q_2. Can we infer t or p from them? If possible, name the inference rules being used at each step.
 From q_2 <-> r_3, ~q_2 we can infer ~r_3 via biconditional elimination. From r_3 <-> w, ~r_3 we can infer ~w via biconditional elimination. From w or t, ~w we can infer t via disjunctive syllogism. Finally, from t we can infer t or p via addition. Therefore, the answer is yes.