Consider the following premises. For all x_8, x_8 is an electrician if and only if x_8 will go running. There is at least one x_8 for which x_8 will not go running. For all x_8, if x_8 were a politician, then x_8 is an electrician. Can we infer the following from them? If we can, name the inference rule being used: There is at least one x_8 for which x_8 is not a politician.
 From the fact that for all x_8, x_8 is an electrician if and only if x_8 will go running, and that there is at least one x_8 for which x_8 will not go running we can infer that there is at least one x_8 for which x_8 is not an electrician via existential biconditional elimination. Finally, from the fact that for all x_8, if x_8 were a politician, then x_8 is an electrician, and that there is at least one x_8 for which x_8 is not an electrician we can infer that there is at least one x_8 for which x_8 is not a politician via existential modus tollens. Therefore, the answer is yes.