Consider the following premises. There is at least one x_9 for which x_9 will take a plane if and only if x_9 will make tea. For all x_9, x_9 will take a plane if and only if x_9 is a writer. For all x_9, x_9 is not a writer. Can we infer the following from them? There is at least one x_9 for which x_9 will not make tea.
 From the fact that there is at least one x_9 for which x_9 will take a plane if and only if x_9 will make tea we can infer that there is at least one x_9 for which if x_9 makes tea, then x_9 is taking a plane. From the fact that for all x_9, x_9 will take a plane if and only if x_9 is a writer, and that for all x_9, x_9 is not a writer we can infer that for all x_9, x_9 will not take a plane. Finally, from the fact that there is at least one x_9 for which if x_9 makes tea, then x_9 is taking a plane, and that for all x_9, x_9 will not take a plane we can infer that there is at least one x_9 for which x_9 will not make tea. Therefore, the answer is yes.