Section 21. The members of the first legislature shall hold office until the first Monday in January, 1913. The terms of office of the members of succeeding legislatures shall be two years. No state senator shall serve more than four consecutive terms in that office, nor shall any state representative serve more than four consecutive terms in that office. This limitation on the number of terms of consecutive service shall apply to terms of office beginning on or after January 1, 1993. No legislator, after serving the maximum number of terms, which shall include any part of a term served, may serve in the same office until he has been out of office for no less than one full term.