What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, x_4 will not work. For all x_4, x_4 will work or x_4 will listen to a song. For all x_4, x_4 will not listen to a song.
Since the premises are contradictory, we can infer anything from them.