Consider the following premises. For all x_8, x_8 will play squash. For all x_8, x_8 will listen to a song if and only if x_8 will play squash. Can we infer the following from them? If we can, name the inference rule being used: For all x_8, x_8 will listen to a song or x_8 is an artist.
 From the fact that for all x_8, x_8 will listen to a song if and only if x_8 will play squash we can infer that for all x_8, if x_8 plays squash, then x_8 is listening to a song via universal biconditional elimination. From the fact that for all x_8, if x_8 plays squash, then x_8 is listening to a song, and that for all x_8, x_8 will play squash we can infer that for all x_8, x_8 will listen to a song via universal modus ponens. Finally, from the fact that for all x_8, x_8 will listen to a song we can infer that for all x_8, x_8 will listen to a song or x_8 is an artist via universal addition. Therefore, the answer is yes.