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_7, x_7 is not a politician. For all x_7, x_7 is a politician or x_7 is a soldier. For all x_7, x_7 is a lawyer.
For all x_7, x_7 is a soldier can be inferred via the universal disjunctive syllogism rule.