What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, y will play a game if and only if y will play squash. Charles is not playing a game. Robert is driving a car or Charles is playing squash.
If Charles doesn't play squash, then Robert is driving a car. For all y, if y plays a game, then y is playing squash. For all y, if y plays squash, then y is playing a game.