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_2 for which y_2 is a nurse if and only if y_2 is a bartender. For all y_2, y_2 is a bartender or y_2 is not a nurse.
For all y_2, if y_2 were a nurse, then y_2 is a bartender. There is at least one y_2 for which if y_2 were a nurse, then y_2 is a bartender. There is at least one y_2 for which if y_2 were a bartender, then y_2 is a nurse.