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 sleep if and only if y will drive a car. For all y, y will not drive a car. Joseph is sleeping if and only if it is late.
If Joseph sleeps, then it is late. If it is late, then Joseph is sleeping. For all y, if y sleeps, then y is driving a car. For all y, if y drives a car, then y is sleeping. For all y, y will not sleep.