What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Barbara is not reading a book. It is raining or Barbara is not making tea. Barbara is making tea if and only if Barbara is reading a book. If it rains, then Barbara is making tea.
If Barbara makes tea, then it is raining. If Barbara makes tea, then Barbara is reading a book. If Barbara reads a book, then Barbara is making tea. Barbara is not making tea.