Consider the following premises. u <-> q_16. u or ~p. ~q_16. p or ~u. Can we infer p from them? If possible, name the inference rules being used at each step.
 From u <-> q_16, ~q_16 we can infer ~u via biconditional elimination. From p or ~u we can infer u -> p via rewriting. From u or ~p we can infer p -> u via rewriting. From p -> u, u -> p we can infer p <-> u via biconditional introduction. Finally, from p <-> u, ~u we can infer ~p via biconditional elimination, which contradicts p. Therefore, the answer is no.