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"On Contradiction" and "On Practice" are important philosophical works that outline his views on dialectical materialism and the acquisition of knowledge. In "On Contradiction," Mao argues that all things in the world are contradictory, and that these contradictions are the driving force of change. He identifies two basic types of contradictions: principal contradictions and secondary contradictions. In "On Practice," Mao argues that knowledge is acquired through practice. He identifies three stages in the acquisition of knowledge: perception, comprehension, and application.
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