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: There is at least one x_12 for which x_12 is not a politician. For all x_12, x_12 is a politician. For all x_12, x_12 is a taxi driver.
For all x_12, x_12 is a politician and x_12 is a taxi driver can be inferred via the universal conjunction rule. For all x_12, x_12 is a taxi driver and x_12 is a politician can be inferred via the universal conjunction rule.