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: There is at least one x_15 for which if x_15 listens to a song, then x_15 is drinking water. For all x_15, x_15 will listen to a song or x_15 will not drive a car. For all x_15, if x_15 plays a game, then x_15 is driving a car. For all x_15, x_15 will play a game if and only if x_15 will drink water.
For all x_15, if x_15 drives a car, then x_15 is listening to a song can be inferred via the universal rewriting rule. For all x_15, if x_15 plays a game, then x_15 is drinking water can be inferred via the universal biconditional elimination rule. For all x_15, if x_15 drinks water, then x_15 is playing a game can be inferred via the universal biconditional elimination rule.