15版 - 湖南张家界 以生态之笔书写绿水青山答卷

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Associativity: when merging three (or more) states, it doesn’t matter which are merged first; (A ∨ B) ∨ C = A ∨ (B ∨ C). If Alice receives states from both Bob and Carol, she can merge them into her own state in any order and the result will be the same.4

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"It was a matter of arriving on location and seeing the sun go down to get into position to wait for the sky to darken."