Consider the following premises. For all x_6, x_6 is a janitor or x_6 will drink water. For all x_6, x_6 is an electrician or x_6 is a bartender. For all x_6, x_6 is not a janitor. For all x_6, x_6 is not an electrician. Can we infer the following from them? There is at least one x_6 for which either x_6 is a bartender or x_6 will drink water are not true.
 From the fact that for all x_6, x_6 is an electrician or x_6 is a bartender, and that for all x_6, x_6 is not an electrician we can infer that for all x_6, x_6 is a bartender. From the fact that for all x_6, x_6 is a janitor or x_6 will drink water, and that for all x_6, x_6 is not a janitor we can infer that for all x_6, x_6 will drink water. Finally, from the fact that for all x_6, x_6 is a bartender, and that for all x_6, x_6 will drink water we can infer that for all x_6, x_6 is a bartender and x_6 will drink water, which contradicts that There is at least one x_6 for which either x_6 is a bartender or x_6 will drink water are not true. Therefore, the answer is no.