Consider the following premises. q_6 -> p. p_6 or p_1. q_2 -> p. p_1 -> q_2. p_6 -> q_6. Can we infer p from them? If possible, name the inference rules being used at each step.
 From p_6 -> q_6, q_6 -> p we can infer p_6 -> p via transitivity. From p_1 -> q_2, q_2 -> p we can infer p_1 -> p via transitivity. Finally, from p_6 -> p, p_1 -> p, p_6 or p_1 we can infer p via disjunction elimination. Therefore, the answer is yes.