What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, x_9 is not a server. For all x_9, if x_9 reads a book, then x_9 is an office clerk. For all x_9, x_9 is a server or x_9 is an artist. There is at least one x_9 for which x_9 is an office clerk if and only if x_9 is an artist.
For all x_9, x_9 is an artist. There is at least one x_9 for which if x_9 were an office clerk, then x_9 is an artist. There is at least one x_9 for which if x_9 were an artist, then x_9 is an office clerk.