Consider the following premises. For all x, if x drinks water, then x is a cashier. For all x, if x takes a plane, then x is drinking water. For all x, x will take a plane. Can we infer the following from them? If we can, name the inference rule being used: For all x, x is a cashier.
 From the fact that for all x, if x takes a plane, then x is drinking water, and that for all x, if x drinks water, then x is a cashier we can infer that for all x, if x takes a plane, then x is a cashier via universal transitivity. Finally, from the fact that for all x, if x takes a plane, then x is a cashier, and that for all x, x will take a plane we can infer that for all x, x is a cashier via universal modus ponens. Therefore, the answer is yes.