What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_8, x_8 is a bartender. For all x_8, x_8 is a bartender if and only if x_8 will play tennis.
For all x_8, if x_8 were a bartender, then x_8 is playing tennis can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 plays tennis, then x_8 is a bartender can be inferred via the universal biconditional elimination rule.