What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_21, x_21 will play a game if and only if x_21 is an office clerk. For all x_21, x_21 will cook or x_21 will drink water. For all x_21, if x_21 cooks, then x_21 is playing a game. For all x_21, if x_21 drinks water, then x_21 is playing a game.
For all x_21, x_21 will play a game. For all x_21, if x_21 plays a game, then x_21 is an office clerk. For all x_21, if x_21 were an office clerk, then x_21 is playing a game.