What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, if z makes tea, then z is working. There is at least one z for which if z works, then z is making tea. For all z, z will not make tea. For all z, z will work if and only if z will read a book.
There is at least one z for which z will not work. There is at least one z for which z will work if and only if z will make tea. There is at least one z for which z will make tea if and only if z will work. For all z, if z works, then z is reading a book. For all z, if z reads a book, then z is working.