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