What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_1, if y_1 plays a game, then y_1 is a janitor. For all y_1, y_1 is a janitor if and only if y_1 will play a game.
For all y_1, if y_1 were a janitor, then y_1 is playing a game. For all y_1, if y_1 plays a game, then y_1 is a janitor.