What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 is rich or x_6 will listen to a song. For all x_6, x_6 will not listen to a song. For all x_6, x_6 is not rich or x_6 is a police officer. For all x_6, x_6 will sleep.
For all x_6, x_6 will listen to a song or x_6 is a police officer.