Consider the following premises. For all x_18, x_18 is a server. For all x_25, x_25 will take a plane if and only if x_25 is a cashier. For all x_25, x_25 will take a plane. Can we infer the following from them? Linda is a server and Elisabeth is a cashier.
 From the fact that for all x_25, x_25 will take a plane if and only if x_25 is a cashier we can infer that for all x_25, if x_25 takes a plane, then x_25 is a cashier. From the fact that for all x_25, if x_25 takes a plane, then x_25 is a cashier, and that for all x_25, x_25 will take a plane we can infer that for all x_25, x_25 is a cashier. From the fact that for all x_18, x_18 is a server we can infer that Linda is a server. From the fact that for all x_25, x_25 is a cashier we can infer that Elisabeth is a cashier. Finally, from the fact that Linda is a server, and that Elisabeth is a cashier we can infer that Linda is a server and Elisabeth is a cashier. Therefore, the answer is yes.