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Contrast Cluster

Both structural opposites are invariant, only energy exchange provides a contrast. This cluster satisfies P = o(P) = e(P).

	A:	Only pure yin can contrast pure yang.	A = ~B	A = e(A) = o(A)	A = e(~B)
	B:	Only pure yang can contrast pure yin.	B = ~A	B = e(B) = o(B)	B = e(~A)

This is the same as the

• internal energy boundary set b(P) = 0.