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
Phil Collins, Pink and Shakira nominated for Rock & Roll Hall of Fame
，这一点在电影中也有详细论述
Силовые структуры
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Grammar specification of the extensions to the type language