What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, if x_9 reads a book, then x_9 is listening to a song. There is at least one x_9 for which x_9 is rich. For all x_9, if x_9 were a doctor, then x_9 is listening to a song. For all x_9, x_9 is a doctor. For all x_9, if x_9 listens to a song, then x_9 is a janitor.
For all x_9, x_9 will listen to a song. For all x_9, if x_9 reads a book, then x_9 is a janitor. For all x_9, if x_9 were a doctor, then x_9 is a janitor. There is at least one x_9 for which x_9 is rich and x_9 is a doctor. There is at least one x_9 for which x_9 is a doctor and x_9 is rich.