Consider the following premises. For all x_9, x_9 will drink water. For all x_9, if x_9 drinks water, then x_9 is making tea. For all x_9, if x_9 were fast, then x_9 is taking a plane. For all x_9, if x_9 makes tea, then x_9 is taking a plane. Can we infer the following from them? If we can, name the inference rule being used: Charles is taking a plane.
 From the fact that for all x_9, x_9 will drink water we can infer that for all x_9, x_9 will drink water or x_9 is fast via universal addition. From the fact that for all x_9, if x_9 drinks water, then x_9 is making tea, and that for all x_9, if x_9 makes tea, then x_9 is taking a plane we can infer that for all x_9, if x_9 drinks water, then x_9 is taking a plane via universal transitivity. From the fact that for all x_9, if x_9 drinks water, then x_9 is taking a plane, that for all x_9, if x_9 were fast, then x_9 is taking a plane, and that for all x_9, x_9 will drink water or x_9 is fast we can infer that for all x_9, x_9 will take a plane via universal disjunction elimination. Finally, from the fact that for all x_9, x_9 will take a plane we can infer that Charles is taking a plane via universal instantiation. Therefore, the answer is yes.