What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all y_4, y_4 is a bartender or y_4 is not poor. There is at least one y_4 for which if y_4 were a bartender, then y_4 is poor.
For all y_4, if y_4 were poor, then y_4 is a bartender can be inferred via the universal rewriting rule.