Consider the following premises. For all x_23, x_23 is an electrician if and only if x_23 will make tea. For all x_23, x_23 is an electrician if and only if x_23 is a bartender. For all x_23, if x_23 were an office clerk, then x_23 is making tea. There is at least one x_23 for which x_23 is a bartender if and only if x_23 is curious. For all x_23, x_23 is not curious. Can we infer the following from them? There is at least one x_23 for which x_23 is not an office clerk.
 From the fact that there is at least one x_23 for which x_23 is a bartender if and only if x_23 is curious, and that for all x_23, x_23 is not curious we can infer that there is at least one x_23 for which x_23 is not a bartender. From the fact that for all x_23, x_23 is an electrician if and only if x_23 is a bartender, and that there is at least one x_23 for which x_23 is not a bartender we can infer that there is at least one x_23 for which x_23 is not an electrician. From the fact that for all x_23, x_23 is an electrician if and only if x_23 will make tea, and that there is at least one x_23 for which x_23 is not an electrician we can infer that there is at least one x_23 for which x_23 will not make tea. Finally, from the fact that for all x_23, if x_23 were an office clerk, then x_23 is making tea, and that there is at least one x_23 for which x_23 will not make tea we can infer that there is at least one x_23 for which x_23 is not an office clerk. Therefore, the answer is yes.