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Discord's face scanning age checks 'start of a bigger shift'，更多细节参见51吃瓜
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* @param arr 数组。关于这个话题，Line官方版本下载提供了深入分析
For SAT problems with 10 variables and 200 clauses, it usually output SAT as expected, but the assignment was never valid (Examples: first, second). Once it claimed a SAT formula was UNSAT. For this reason I didn't bother testing with more variables for the SAT case.