* 1. 转换视角：将"追车"问题转为"到达时间"比较（后车时间≤前车 → 合并）；
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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.