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_18, x_18 will go running if and only if x_18 is a bartender. For all x_18, if x_18 were a politician, then x_18 is a bartender. For all x_18, x_18 will go running.
For all x_18, if x_18 goes running, then x_18 is a bartender can be inferred via the universal biconditional elimination rule. For all x_18, if x_18 were a bartender, then x_18 is running can be inferred via the universal biconditional elimination rule.