What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_14, x_14 is a bartender if and only if x_14 will listen to a song. James is a taxi driver or Charles is not a bartender.
If Charles were a bartender, then James is a taxi driver. For all x_14, if x_14 were a bartender, then x_14 is listening to a song. For all x_14, if x_14 listens to a song, then x_14 is a bartender.