What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, x_13 will sleep or x_13 is an astronaut. There is at least one x_13 for which if x_13 sleeps, then x_13 is listening to a song. For all x_13, if x_13 were an astronaut, then x_13 is a writer. For all x_13, x_13 will not listen to a song or x_13 will play tennis. For all x_13, if x_13 were a writer, then x_13 is listening to a song.
For all x_13, if x_13 were an astronaut, then x_13 is listening to a song.