Consider the following premises. There is at least one x_15 for which x_15 will make tea if and only if x_15 will take a plane. For all x_15, if x_15 takes a plane, then x_15 is an artist. For all x_15, if x_15 were an artist, then x_15 is driving a car. For all x_15, x_15 will not drive a car. For all x_15, if x_15 makes tea, then x_15 is taking a plane. Can we infer the following from them? There is at least one x_15 for which x_15 will not make tea.
 From the fact that there is at least one x_15 for which x_15 will make tea if and only if x_15 will take a plane we can infer that there is at least one x_15 for which if x_15 takes a plane, then x_15 is making tea. From the fact that for all x_15, if x_15 takes a plane, then x_15 is an artist, and that for all x_15, if x_15 were an artist, then x_15 is driving a car we can infer that for all x_15, if x_15 takes a plane, then x_15 is driving a car. From the fact that for all x_15, if x_15 takes a plane, then x_15 is driving a car, and that for all x_15, x_15 will not drive a car we can infer that for all x_15, x_15 will not take a plane. From the fact that there is at least one x_15 for which if x_15 takes a plane, then x_15 is making tea, and that for all x_15, if x_15 makes tea, then x_15 is taking a plane we can infer that there is at least one x_15 for which x_15 will take a plane if and only if x_15 will make tea. Finally, from the fact that there is at least one x_15 for which x_15 will take a plane if and only if x_15 will make tea, and that for all x_15, x_15 will not take a plane we can infer that there is at least one x_15 for which x_15 will not make tea. Therefore, the answer is yes.