Consider the following premises. For all x_18, x_18 is not a janitor. For all x_18, x_18 will drink water if and only if x_18 is a janitor. For all x_18, x_18 will drink water or x_18 is an electrician. Can we infer the following from them? There is at least one z for which z is an electrician or z is rich.
 From the fact that for all x_18, x_18 will drink water if and only if x_18 is a janitor, and that for all x_18, x_18 is not a janitor we can infer that for all x_18, x_18 will not drink water. From the fact that for all x_18, x_18 will drink water or x_18 is an electrician, and that for all x_18, x_18 will not drink water we can infer that for all x_18, x_18 is an electrician. From the fact that for all x_18, x_18 is an electrician we can infer that William is an electrician. From the fact that William is an electrician we can infer that there is at least one z for which z is an electrician. Finally, from the fact that there is at least one z for which z is an electrician we can infer that there is at least one z for which z is an electrician or z is rich. Therefore, the answer is yes.