Consider the following premises. For all x_9, x_9 is an electrician or x_9 will not write a letter. If Karen were an electrician, then Karen is writing a letter. Can we infer the following from them? If we can, name the inference rule being used: If Karen writes a letter, then Karen is an electrician.
 From the fact that for all x_9, x_9 is an electrician or x_9 will not write a letter we can infer that for all x_9, if x_9 writes a letter, then x_9 is an electrician via universal rewriting. Finally, from the fact that for all x_9, if x_9 writes a letter, then x_9 is an electrician we can infer that if Karen writes a letter, then Karen is an electrician via universal instantiation. Therefore, the answer is yes.