For UNSAT problems with 10 variables and 200 clauses, it always claimed that the formula is SAT and made up assignments (See this example).
If we don't have a bucket, we can allocate it out of the next larger slot
，详情可参考新收录的资料
我决定用最笨的办法来验证：设计对照实验，调 API，跑数据，让结果说话。
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