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 a writer. If Thomas reads a book, then Barbara is a bartender. Barbara is a bartender if and only if Thomas is reading a book.
If Barbara were a bartender, then Thomas is reading a book. If Thomas reads a book, then Barbara is a bartender.