Small blueprints are difficult. Because the small blueprint refers to the Olympiad, with complex questions and small series, it is the most difficult Olympiad in junior high school, which is much higher than the topics in junior high school mathematics textbooks, and requires students to have a solid mathematical foundation and high mathematical thinking ability. Taitu number theory is two important branches of mathematics, which only needs to master good abstract thinking ability. So it's hard to make a small blueprint.