Consider the following premises. For all x_15, x_15 will write a letter or x_15 will play squash. For all x_15, x_15 will not play tennis. For all x_15, x_15 will not write a letter or x_15 is an office clerk. There is at least one x_15 for which x_15 will play tennis or x_15 will work. For all x_15, x_15 will not play squash. Can we infer the following from them? If we can, name the inference rule being used: For all x_15, x_15 will not play tennis.
That is one of the premises. Therefore, the answer is yes.