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_20, x_20 will play a game and x_20 will drive a car. For all x_9, x_9 will climb a mountain.
For all x_20, x_20 will play a game can be inferred via the universal simplification rule. For all x_20, x_20 will drive a car can be inferred via the universal simplification rule.