What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Robert were excited, then David is an astronaut. For all x_15, if x_15 plays a game, then x_15 is reading a book. If John were a server, then Karen is playing a game. If Karen reads a book, then Robert is excited.
If Karen reads a book, then David is an astronaut.