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 is a carpenter or x will write a letter. There is at least one x for which x is a cashier. For all x, if x were a carpenter, then x is driving a car. For all x, x will write a letter if and only if x will drive a car.
For all x, if x writes a letter, then x is driving a car. For all x, if x drives a car, then x is writing a letter.