Four Great Yuan Dramatists, namely: Guan Hanqing 关汉卿[guān hàn qīng], Zheng Guangzu 郑光祖[zhèng guāng zǔ], Ma Zhiyuan 马致远[mǎ zhì yuǎn] and Bai Pu 白朴[bái pǔ]
Four great compilations of Northern Song dynasty, namely: Extensive records of the Taiping era (978) 太平广记, Imperial readings of the Taiping era 太平御览, Prime tortoise of the record bureau 册府元龟, Finest blossoms in the garden of literature 文苑英华
the Four Cardinal Principles enunciated by Deng Xiaoping 邓小平[dèng xiǎo píng] in 1979: to uphold the socialist road, the dictatorship of the proletariat, the leadership of the CCP, and Maoism and Marxism-Leninism
the five emphases, four beauties and three loves (PRC policy introduced in 1981, including emphasis on manners, beauty of language and love of socialism)