Consider the following premises. S_10(a_10) -> p_6. R_10(a_10) -> p_6. p_6 -> S_10(a_10). forall x_10: R_10(x_10) or S_10(x_10). Can we infer p_6 from them? If possible, name the inference rules being used at each step.
 From forall x_10: R_10(x_10) or S_10(x_10) we can infer R_10(a_10) or S_10(a_10) via universal instantiation. From p_6 -> S_10(a_10), S_10(a_10) -> p_6 we can infer p_6 <-> S_10(a_10) via biconditional introduction. From p_6 <-> S_10(a_10) we can infer S_10(a_10) -> p_6 via biconditional elimination. Finally, from R_10(a_10) -> p_6, S_10(a_10) -> p_6, R_10(a_10) or S_10(a_10) we can infer p_6 via disjunction elimination. Therefore, the answer is yes.