What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Sarah takes a plane, then Sarah is a soldier. For all x_8, if x_8 were a soldier, then x_8 is taking a plane. For all x_8, if x_8 takes a plane, then x_8 is a soldier.
For all x_8, x_8 is a soldier if and only if x_8 will take a plane. For all x_8, x_8 will take a plane if and only if x_8 is a soldier.