What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, x_10 is a sailor if and only if x_10 is a cashier. For all x_10, x_10 is a sailor. There is at least one x_10 for which x_10 is a bartender if and only if x_10 is a cashier.
For all x_10, if x_10 were a sailor, then x_10 is a cashier. There is at least one x_10 for which if x_10 were a bartender, then x_10 is a cashier. For all x_10, if x_10 were a cashier, then x_10 is a sailor. There is at least one x_10 for which if x_10 were a cashier, then x_10 is a bartender.