On this day, 48 years ago, on September 7, 1977 (July 24, 1977 in the lunar calendar), primary and secondary school textbooks were cleared of "helping words." On September 7, 1977, the Ministry of Education issued a notice requesting the removal of the speeches, articles, and images of the Gang of Four and their remaining parties from primary and secondary school textbooks. The notice pointed out that in primary and secondary school textbooks, the speeches and articles of the Gang of Four and their writing teams under their control, such as Liang Xiao, Chulan, Jiang Tian, Chi Heng, Luo Siding, etc., were used in the past. Now they should be completely eliminated to eliminate their pernicious effects.