What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Michael is not a doctor. For all x_8, if x_8 were a doctor, then x_8 is listening to a song. For all x_8, if x_8 listens to a song, then x_8 is a doctor. For all x_8, if x_8 listens to a song, then x_8 is a doctor.
For all x_8, x_8 is a doctor if and only if x_8 will listen to a song. For all x_8, x_8 is a doctor if and only if x_8 will listen to a song. For all x_8, x_8 will listen to a song if and only if x_8 is a doctor. For all x_8, x_8 will listen to a song if and only if x_8 is a doctor.