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 y_2, y_2 will work or y_2 is an office clerk. For all y_2, y_2 will work if and only if y_2 is a soldier. For all y_2, y_2 is not a soldier.
For all y_2, if y_2 works, then y_2 is a soldier can be inferred via the universal biconditional elimination rule. For all y_2, if y_2 were a soldier, then y_2 is working can be inferred via the universal biconditional elimination rule. For all y_2, y_2 will not work can be inferred via the universal biconditional elimination rule.