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_16, if x_16 were excited, then x_16 is a cashier. For all x_16, x_16 is a cashier if and only if x_16 is a taxi driver. For all x_16, x_16 is a nurse or x_16 is a taxi driver. There is at least one x_16 for which x_16 is excited if and only if x_16 is a bartender. For all x_16, x_16 is not a nurse or x_16 is a bartender.
For all x_16, x_16 is a taxi driver or x_16 is a bartender can be inferred via the universal resolution rule. For all x_16, if x_16 were a cashier, then x_16 is a taxi driver can be inferred via the universal biconditional elimination rule. There is at least one x_16 for which if x_16 were excited, then x_16 is a bartender can be inferred via the existential biconditional elimination rule. For all x_16, if x_16 were a taxi driver, then x_16 is a cashier can be inferred via the universal biconditional elimination rule. There is at least one x_16 for which if x_16 were a bartender, then x_16 is excited can be inferred via the existential biconditional elimination rule.