What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 is a doctor or x_7 will listen to a song. For all x_7, if x_7 were a doctor, then x_7 is not sleeping. For all x_7, x_7 will sleep.
For all x_7, x_7 is not a doctor.