What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Richard were a cashier, then Sarah is climbing a mountain. For all x_8, x_8 will sleep or x_8 is a cashier. Sarah is climbing a mountain if and only if Richard is sleeping.
If Sarah climbs a mountain, then Richard is sleeping. If Richard sleeps, then Sarah is climbing a mountain.