What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_3, z_3 is a police officer. For all x_18, x_18 will play a game if and only if x_18 will drink water. For all x_18, x_18 will not drink water. For all x_18, x_18 will play a game or x_18 is a bartender.
For all x_18, if x_18 plays a game, then x_18 is drinking water. For all x_18, if x_18 drinks water, then x_18 is playing a game. For all x_18, x_18 will not play a game.