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 a mechanic or x is not an office clerk. For all x, x is an artist if and only if x is a mechanic. There is at least one x for which if x were an artist, then x is an office clerk.
For all x, if x were an office clerk, then x is a mechanic. For all x, if x were an artist, then x is a mechanic. For all x, if x were a mechanic, then x is an artist.