What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, y will listen to a song if and only if y will make tea. For all y, if y makes tea, then y is listening to a song.
For all y, if y listens to a song, then y is making tea. For all y, if y makes tea, then y is listening to a song.