What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_10, x_10 will not play a game. For all x_10, x_10 will drive a car if and only if x_10 will play a game. For all x_10, x_10 will drive a car. For all x_10, x_10 is a cashier.
Since the premises are contradictory, we can infer anything from them.