Consider the following premises. For all x_10, x_10 will make tea if and only if x_10 is a soldier. For all x_10, x_10 is a soldier or x_10 is not fast. For all x_10, if x_10 makes tea, then x_10 is fast. Can we infer the following from them? There is at least one x_10 for which if is not true that x_10 is a soldier if and only if x_10 will make tea.
 From the fact that for all x_10, x_10 is a soldier or x_10 is not fast we can infer that for all x_10, if x_10 were fast, then x_10 is a soldier. From the fact that for all x_10, if x_10 makes tea, then x_10 is fast, and that for all x_10, if x_10 were fast, then x_10 is a soldier we can infer that for all x_10, if x_10 makes tea, then x_10 is a soldier. From the fact that for all x_10, x_10 will make tea if and only if x_10 is a soldier we can infer that for all x_10, if x_10 were a soldier, then x_10 is making tea. Finally, from the fact that for all x_10, if x_10 were a soldier, then x_10 is making tea, and that for all x_10, if x_10 makes tea, then x_10 is a soldier we can infer that for all x_10, x_10 is a soldier if and only if x_10 will make tea, which contradicts that There is at least one x_10 for which if is not true that x_10 is a soldier if and only if x_10 will make tea. Therefore, the answer is no.