Section 2 - Term of office of city supervisors1. The term of office of each supervisor hereafter elected in a city shall, notwithstanding the provisions of such city charter, be two years, and a supervisor shall only be elected in such city each second year thereafter, except to fill vacancies.2. Notwithstanding any provision of subdivision one of this section, but subject to the mandatory referendum provisions of section twenty-three of the municipal home rule law, the term of office of each supervisor hereafter elected in the city of Geneva shall, notwithstanding the provisions of such city charter, be four years, and a supervisor shall only be elected in such city each fourth year thereafter, except to fill vacancies.