The city council shall continue to hold office until their successors are elected and qualified at the next biennial municipal elections to be conducted as provided in Chapter 35A.29 RCW. The four existing city council positions, including the position of councilman at large, which terms will expire January 10, 1972, shall be elected for four-year terms in the 1971 municipal elections. The three existing city council positions which terms expire January 14, 1974, shall be elected for new four-year terms in the 1973 municipal elections. Thereafter the requisite number of city council positions shall be filled by election biennially as the terms of their predecessors expire and shall serve for terms of four years. The positions to be filled on the city council shall be designated by consecutive numbers and shall be dealt with as separate offices for all election purposes as provided by Chapter 35A.29 RCW. (Ord. 619 § 3, 1971)