Consider the following premises. For all x_5, if x_5 works, then x_5 is writing a letter. There is at least one x_5 for which x_5 will play squash or x_5 is a musician. For all x_5, x_5 will not write a letter. For all x_5, if x_5 plays squash, then x_5 is working. Can we infer the following from them? For all x_5, x_5 is not a musician.
 From the fact that for all x_5, if x_5 plays squash, then x_5 is working, and that for all x_5, if x_5 works, then x_5 is writing a letter we can infer that for all x_5, if x_5 plays squash, then x_5 is writing a letter. From the fact that for all x_5, if x_5 plays squash, then x_5 is writing a letter, and that for all x_5, x_5 will not write a letter we can infer that for all x_5, x_5 will not play squash. Finally, from the fact that there is at least one x_5 for which x_5 will play squash or x_5 is a musician, and that for all x_5, x_5 will not play squash we can infer that there is at least one x_5 for which x_5 is a musician, which contradicts that For all x_5, x_5 is not a musician. Therefore, the answer is no.