Consider the following premises. For all x_10, if x_10 were a mechanic, then x_10 is rich. For all x_10, x_10 is rich or x_10 is not a cashier. For all x_10, x_10 will take a plane or x_10 is a janitor. For all x_10, x_10 is a cashier or x_10 is a mechanic. For all x_10, x_10 will not take a plane. Can we infer the following from them? There is at least one x_10 for which either x_10 is rich or x_10 is a janitor are not true.
 From the fact that for all x_10, x_10 will take a plane or x_10 is a janitor, and that for all x_10, x_10 will not take a plane we can infer that for all x_10, x_10 is a janitor. From the fact that for all x_10, x_10 is rich or x_10 is not a cashier we can infer that for all x_10, if x_10 were a cashier, then x_10 is rich. From the fact that for all x_10, if x_10 were a cashier, then x_10 is rich, that for all x_10, if x_10 were a mechanic, then x_10 is rich, and that for all x_10, x_10 is a cashier or x_10 is a mechanic we can infer that for all x_10, x_10 is rich. Finally, from the fact that for all x_10, x_10 is rich, and that for all x_10, x_10 is a janitor we can infer that for all x_10, x_10 is rich and x_10 is a janitor, which contradicts that There is at least one x_10 for which either x_10 is rich or x_10 is a janitor are not true. Therefore, the answer is no.