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Paperback
First published January 1, 1971
"... if in any process there are a number of contradictions, one of them must be the principle contradiction playing the leading and decisive role, while the rest occupy a secondary and subordinate position. Therefore, in studying any complex process in which there are two or more contradictions, we must devote every effort to finding its principle contradiction. Once this principle contradiction is grasped, all problems can be readily solved. 69"