What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, if x takes a plane, then x is reading a book. For all x, x will not take a plane. For all x, if x reads a book, then x is taking a plane.
For all x, x will not read a book. For all x, x will take a plane if and only if x will read a book. For all x, x will read a book if and only if x will take a plane.