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 musician. For all x, x is a janitor or x is a cashier. There is at least one x for which if x were a janitor, then x is a musician. For all x, x is a lawyer.
There is at least one x for which x is not a janitor.