Consider the following premises. For all x_8, x_8 is fast. For all x_8, x_8 is an office clerk if and only if x_8 will make tea. For all x_8, x_8 is an office clerk. Can we infer the following from them? There is at least one x_8 for which x_8 will not make tea.
 From the fact that for all x_8, x_8 is an office clerk if and only if x_8 will make tea we can infer that for all x_8, if x_8 were an office clerk, then x_8 is making tea. From the fact that for all x_8, x_8 is an office clerk, and that for all x_8, x_8 is fast we can infer that for all x_8, x_8 is an office clerk and x_8 is fast. From the fact that for all x_8, x_8 is an office clerk and x_8 is fast we can infer that for all x_8, x_8 is an office clerk. Finally, from the fact that for all x_8, if x_8 were an office clerk, then x_8 is making tea, and that for all x_8, x_8 is an office clerk we can infer that for all x_8, x_8 will make tea, which contradicts that There is at least one x_8 for which x_8 will not make tea. Therefore, the answer is no.