Consider the following premises. For all x_6, if x_6 were poor, then x_6 is writing a letter. For all x_6, if x_6 writes a letter, then x_6 is a poet. Sarah is not a poet. Can we infer the following from them? If we can, name the inference rule being used: Sarah is not a poet.
That is one of the premises. Therefore, the answer is yes.