What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, if x_4 were an astronaut, then x_4 is reading a book. For all x_4, if x_4 were an artist, then x_4 is excited. For all x_4, x_4 is an artist. There is at least one x_4 for which if x_4 reads a book, then x_4 is excited.
For all x_4, x_4 is excited. There is at least one x_4 for which if x_4 were an astronaut, then x_4 is excited.