What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, x_13 is a musician if and only if x_13 is an artist. Linda is an office clerk if and only if Sarah is an artist. Linda is an office clerk or Sarah is a musician.
If Sarah were a bartender, then Linda is an office clerk. If Linda were an office clerk, then Sarah is an artist. If Sarah were an artist, then Linda is an office clerk. For all x_13, if x_13 were a musician, then x_13 is an artist. For all x_13, if x_13 were an artist, then x_13 is a musician.