What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it rains, then John is a mechanic. If Patricia reads a book, then it is raining. If it is cold, then Patricia is reading a book. If John were a mechanic, then it is cold.
If it rains, then it is cold. If Patricia reads a book, then John is a mechanic. If it is cold, then it is raining. If John were a mechanic, then Patricia is reading a book.