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Continue to ChatYang cannot exist by itself; it can exist only when it is supported by yin. Hence yin is the foundation of yang. Similarly, yin cannot alone manifest itself; it can manifest itself only when accompanied by yang. Hence yang is the expression of yin. Yang controls the origination and enjoys the completion [of things] while yin follows the way [yang produces] and completes the work of yang. (Shao Yong)