Consider the following premises. P_6(a_5) or s_3. s_3 -> R_6(a_5). forall x_6: P_6(x_6) -> Q_6(x_6). forall x_6: Q_6(x_6) -> R_6(x_6). Can we infer R_6(a_5) from them?
 From forall x_6: P_6(x_6) -> Q_6(x_6), forall x_6: Q_6(x_6) -> R_6(x_6) we can infer forall x_6: P_6(x_6) -> R_6(x_6). From forall x_6: P_6(x_6) -> R_6(x_6) we can infer P_6(a_5) -> R_6(a_5). Finally, from P_6(a_5) -> R_6(a_5), s_3 -> R_6(a_5), P_6(a_5) or s_3 we can infer R_6(a_5). Therefore, the answer is yes.