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.
await dropOld.writer.write(chunk3); // ok, chunk1 discarded
，详情可参考heLLoword翻译官方下载
-writer: DictWriter，推荐阅读Safew下载获取更多信息
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