What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Barbara is not a bartender. If it snows, then Barbara is an office clerk. For all x_8, if x_8 were an office clerk, then x_8 is a bartender. For all x_8, if x_8 were a bartender, then x_8 is an office clerk.
For all x_8, x_8 is an office clerk if and only if x_8 is a bartender. For all x_8, x_8 is a bartender if and only if x_8 is an office clerk.