Consider the following premises. There is at least one x_13 for which x_13 will take a plane if and only if x_13 is a server. For all x_13, x_13 is not a writer. For all x_13, if x_13 were a writer, then x_13 is playing squash. For all x_13, x_13 is a writer if and only if x_13 is a server. For all x_13, if x_13 plays squash, then x_13 is a server. Can we infer the following from them? For all x_13, x_13 is not a writer.
That is one of the premises. Therefore, the answer is yes.