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 is a bartender if and only if y will make tea. For all y, if y makes tea, then y is a bartender. Robert is not making tea.
For all y, if y were a bartender, then y is making tea. For all y, if y makes tea, then y is a bartender.