What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_17, if x_17 reads a book, then x_17 is working. There is at least one x_17 for which if x_17 works, then x_17 is not a janitor. For all x_17, if x_17 works, then x_17 is reading a book. For all x_17, x_17 is not a poet. For all x_17, x_17 is a poet or x_17 is a janitor.
For all x_17, x_17 is a janitor. For all x_17, x_17 will read a book if and only if x_17 will work. For all x_17, x_17 will work if and only if x_17 will read a book.