Consider the following premises. For all x_6, x_6 will work or x_6 will read a book. For all x_6, x_6 will not work or x_6 is a police officer. There is at least one x_6 for which if x_6 were a police officer, then x_6 is an electrician. For all x_6, x_6 is an electrician if and only if x_6 will read a book. Can we infer the following from them? If we can, name the inference rule being used: For all x_6, x_6 is not an electrician.
 From the fact that for all x_6, x_6 will work or x_6 will read a book, and that for all x_6, x_6 will not work or x_6 is a police officer we can infer that for all x_6, x_6 will read a book or x_6 is a police officer via universal resolution. From the fact that for all x_6, x_6 is an electrician if and only if x_6 will read a book we can infer that for all x_6, if x_6 reads a book, then x_6 is an electrician via universal biconditional elimination. Finally, from the fact that for all x_6, if x_6 reads a book, then x_6 is an electrician, that there is at least one x_6 for which if x_6 were a police officer, then x_6 is an electrician, and that for all x_6, x_6 will read a book or x_6 is a police officer we can infer that there is at least one x_6 for which x_6 is an electrician via existential disjunction elimination, which contradicts that For all x_6, x_6 is not an electrician. Therefore, the answer is no.