Consider the following premises. For all z, if z reads a book, then z is not taking a plane. There is at least one z for which z is a server or z will write a letter. For all z, z will not write a letter. For all z, z is not a server or z will take a plane. Can we infer the following from them? If we can, name the inference rule being used: For all z, z will read a book.
 From the fact that there is at least one z for which z is a server or z will write a letter, and that for all z, z is not a server or z will take a plane we can infer that there is at least one z for which z will write a letter or z will take a plane via existential resolution. From the fact that there is at least one z for which z will write a letter or z will take a plane, and that for all z, z will not write a letter we can infer that there is at least one z for which z will take a plane via existential disjunctive syllogism. Finally, from the fact that for all z, if z reads a book, then z is not taking a plane, and that there is at least one z for which z will take a plane we can infer that there is at least one z for which z will not read a book via existential modus tollens, which contradicts that For all z, z will read a book. Therefore, the answer is no.