Consider the following premises. There is at least one x_6 for which if x_6 were a musician, then x_6 is running. For all x_6, if x_6 goes running, then x_6 is playing squash. For all x_6, x_6 will not play squash. For all x_6, if x_6 were a writer, then x_6 is a musician. Can we infer the following from them? There is at least one x_6 for which x_6 is not a writer.
 From the fact that for all x_6, if x_6 were a writer, then x_6 is a musician, and that there is at least one x_6 for which if x_6 were a musician, then x_6 is running we can infer that there is at least one x_6 for which if x_6 were a writer, then x_6 is running. From the fact that for all x_6, if x_6 goes running, then x_6 is playing squash, and that for all x_6, x_6 will not play squash we can infer that for all x_6, x_6 will not go running. Finally, from the fact that there is at least one x_6 for which if x_6 were a writer, then x_6 is running, and that for all x_6, x_6 will not go running we can infer that there is at least one x_6 for which x_6 is not a writer. Therefore, the answer is yes.