The first election to the Senate shall be held in each of the eighty-one electoral divisions specified in Annex 3. Senators who represent electoral divisions No. 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 58, 61, 64, 67, 70, 73, 76, and 79 shall be elected for a two-year electoral term. Senators who represent electoral divisions No. 2, 5, 8, 11, 14, 17, 20, 23, 26, 29, 32, 35, 38, 41, 44, 47, 50, 53, 56, 59, 62, 65, 68, 71, 74, 77, and 80 shall be elected for a four-year electoral term, and Senators who represent the remaining electoral divisions shall be elected for a six-year electoral term.