What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, z will listen to a song if and only if z is happy. Karen is happy. For all x_25, x_25 will drive a car.
There is at least one x for which x is happy. For all z, if z listens to a song, then z is happy. For all z, if z were happy, then z is listening to a song.