What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_2, y_2 is an artist if and only if y_2 is a mechanic. Jennifer is rich if and only if Mary is a mechanic. Jennifer is rich or Mary is an artist.
If Mary were a carpenter, then Jennifer is rich. If Jennifer were rich, then Mary is a mechanic. If Mary were a mechanic, then Jennifer is rich. For all y_2, if y_2 were an artist, then y_2 is a mechanic. For all y_2, if y_2 were a mechanic, then y_2 is an artist.