What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, if x_5 were sad, then x_5 is listening to a song. For all x_5, x_5 is sad or x_5 will drink water. For all x_5, if x_5 listens to a song, then x_5 is reading a book. For all x_5, if x_5 drinks water, then x_5 is reading a book. There is at least one x_5 for which if x_5 drives a car, then x_5 is not reading a book.
For all x_5, if x_5 were sad, then x_5 is reading a book.