This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.
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然而，所有這些問題，都被伊朗最高領袖阿里・哈梅內伊（Ali Khamenei）所稱的伊美關係「非戰、非和」狀態所籠罩。
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"Whether HS2 is a good or bad thing is debatable, but I tell you what, if they built the railway and they didn't do the archaeology that would be more tragic," said historian Graham Evans, who chairs the Northamptonshire Battlefields Society.
圖像來源，AFP via Getty Images。关于这个话题，必应排名_Bing SEO_先做后付提供了深入分析