Consider the following premises. p_11 -> q_16. p_11 <-> p_16. p_16 <-> q_16. Can we infer p_11 -> p_16 from them? If possible, name the inference rules being used at each step.
 From p_16 <-> q_16 we can infer q_16 -> p_16 via biconditional elimination. From p_11 <-> p_16 we can infer p_16 -> p_11 via biconditional elimination. Finally, from p_11 -> q_16, q_16 -> p_16 we can infer p_11 -> p_16 via transitivity. Therefore, the answer is yes.