What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, x is not a doctor. For all x, x is a doctor if and only if x will make tea. For all x, if x were a doctor, then x is making tea.
For all x, if x were a doctor, then x is making tea. For all x, if x makes tea, then x is a doctor. For all x, x will not make tea.