What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_4, y_4 is a bartender or y_4 will play squash. For all y_4, y_4 will not play squash or y_4 is a sailor. For all y_4, y_4 is not a bartender.
For all y_4, y_4 will play squash.