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Extraction code: 12m9 Li Yongle Wang Shian Mathematics Team, through the recent review situation and problems, points out the maze for candidates' sprint review. In the sprint stage, the purpose is to sum up the problems and deficiencies in the topic, check the leaks and fill the gaps according to the outline, improve the actual combat quality, formulate the strategy of doing the topic, plan the draft paper, especially the psychological quality of actual combat.