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 not play squash. For all y, y will play squash or y will sleep. For all y, y will sleep if and only if y will climb a mountain.
For all y, y will sleep. For all y, if y sleeps, then y is climbing a mountain. For all y, if y climbs a mountain, then y is sleeping.