What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one y for which y will drink water if and only if y will play squash. For all y, y is not sad. For all y, y is sad or y will not play squash.
For all y, if y plays squash, then y is sad. There is at least one y for which if y drinks water, then y is playing squash. There is at least one y for which if y plays squash, then y is drinking water.