What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Susan is reading a book if and only if it is raining. If it doesn't rain, then Robert is an artist. Susan is reading a book if and only if it is cold. It is not cold.
If Susan reads a book, then it is raining. If Susan reads a book, then it is cold. If it rains, then Susan is reading a book. If it is cold, then Susan is reading a book. Susan is not reading a book.