What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 is a cashier if and only if x_12 is curious. James is not rich. If Mary were a cashier, then James is rich.
Mary is not a cashier. For all x_12, if x_12 were a cashier, then x_12 is curious. For all x_12, if x_12 were curious, then x_12 is a cashier.