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At the same time, the constant conflict and need for innovative social and political models led to the development of many philosophical doctrines, later known as the Hundred Schools of Thought. The most notable schools of thought include Mohism (expounded by Mozi), Confucianism (represented by Mencius and Xunzi), Legalism (represented by Shang Yang, Shen Buhai, Shen Dao and Han Fei) and Taoism (represented by Zhuangzhi and Lao Tzu).