Consider the following premises. For all x_10, x_10 is a taxi driver or x_10 is a writer. For all x_10, if x_10 were a writer, then x_10 is a soldier. For all x_10, x_10 is a taxi driver if and only if x_10 is a soldier. For all x_10, x_10 is a poet. Can we infer the following from them? If we can, name the inference rule being used: For all x_10, if x_10 were a writer, then x_10 is a soldier.
That is one of the premises. Therefore, the answer is yes.