What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Jessica reads a book, then it is snowing. For all x_10, if x_10 were a janitor, then x_10 is reading a book. For all x_10, if x_10 reads a book, then x_10 is a janitor.
For all x_10, x_10 is a janitor if and only if x_10 will read a book. For all x_10, x_10 will read a book if and only if x_10 is a janitor.