What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all z, if z were an electrician, then z is making tea. For all z, if z reads a book, then z is an electrician. For all z, if z makes tea, then z is reading a book. There is at least one z for which z is not an electrician.
There is at least one z for which z will not read a book can be inferred via the existential modus tollens rule. For all z, if z were an electrician, then z is reading a book can be inferred via the universal transitivity rule. For all z, if z reads a book, then z is making tea can be inferred via the universal transitivity rule. For all z, if z makes tea, then z is an electrician can be inferred via the universal transitivity rule.