What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? John is not an electrician. John is driving a car if and only if Richard is listening to a song. For all y, if y were an electrician, then y is driving a car. For all y, if y drives a car, then y is an electrician.
If John drives a car, then Richard is listening to a song. If Richard listens to a song, then John is driving a car. For all y, y is an electrician if and only if y will drive a car. For all y, y will drive a car if and only if y is an electrician.