What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it snows, then James is an astronaut. If James were an astronaut, then David is bored. James is reading a book or Richard is not a musician. If James reads a book, then it is snowing.
If it snows, then David is bored. If James reads a book, then James is an astronaut. If Richard were a musician, then James is reading a book.