[This section’s article (ARTICLE 22. Habitat for Humanity Fund [18900.20. - 18900.26.]) states its own repeal: “18900.26. … (a) Except as otherwise provided in subdivision (b), this article shall remain in effect only until January 1 of the fifth taxable year following the first appearance of the Habitat for Humanity Fund on the personal income tax return, or January 1, 2021, whichever occurs first, and is repealed as of December 1 of that year.”]