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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.。关于这个话题，WPS官方版本下载提供了深入分析
В России ответили на имитирующие высадку на Украине учения НАТО18:04。关于这个话题，一键获取谷歌浏览器下载提供了深入分析
Danny Fullbrook，更多细节参见夫子