What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, x will drive a car. For all x, if x works, then x is not driving a car. For all x, if x were a taxi driver, then x is working. There is at least one x for which if x works, then x is a taxi driver.
For all x, x will not work. There is at least one x for which x will work if and only if x is a taxi driver. There is at least one x for which x is a taxi driver if and only if x will work.