What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, x_13 is a bartender or x_13 is not a cashier. For all x_13, x_13 is not a bartender. For all x_13, x_13 is fast if and only if x_13 is a cashier. There is at least one x_13 for which if x_13 were a cashier, then x_13 is fast.
For all x_13, if x_13 were a cashier, then x_13 is a bartender. For all x_13, if x_13 were fast, then x_13 is a cashier. For all x_13, if x_13 were a cashier, then x_13 is fast.