 into three classes, with the justices assigned to each class in reverse seniority order, with the most senior justices in the earliest classes. The terms of office for justices in the first class will expire at the end of the fourth year, following the ratification of the amendment. The terms for the justices of the second class will expire at the end of the eighth year, and of the third class at the end of the twelfth year, so that one-third of the justices may be chosen every fourth year.