What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_15, x_15 is not a cashier. For all x_15, if x_15 were a bartender, then x_15 is a cashier. For all x_15, x_15 is a bartender if and only if x_15 is an electrician. There is at least one x_15 for which x_15 is an electrician.
For all x_15, x_15 is not a bartender. For all x_15, if x_15 were a bartender, then x_15 is an electrician. For all x_15, if x_15 were an electrician, then x_15 is a bartender.