Consider the following premises. For all x_18, if x_18 were a lawyer, then x_18 is running. For all x_18, x_18 will listen to a song. For all x_18, x_18 will listen to a song if and only if x_18 will go running. Can we infer the following from them? If we can, name the inference rule being used: Karen is running or John is making tea.
 From the fact that for all x_18, x_18 will listen to a song we can infer that for all x_18, x_18 will listen to a song or x_18 is a lawyer via universal addition. From the fact that for all x_18, x_18 will listen to a song if and only if x_18 will go running we can infer that for all x_18, if x_18 listens to a song, then x_18 is running via universal biconditional elimination. From the fact that for all x_18, if x_18 listens to a song, then x_18 is running, that for all x_18, if x_18 were a lawyer, then x_18 is running, and that for all x_18, x_18 will listen to a song or x_18 is a lawyer we can infer that for all x_18, x_18 will go running via universal disjunction elimination. From the fact that for all x_18, x_18 will go running we can infer that Karen is running via universal instantiation. Finally, from the fact that Karen is running we can infer that Karen is running or John is making tea via addition. Therefore, the answer is yes.