The user will give a CNF in dimacs format.
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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）
Area Clusters: The map is intelligently segmented into numerous small regions or clusters.