I learned that for 4-SAT, if clause to variable ratio is more than 10, the generated problems become difficult to solve, and the likelihood of formula to be SAT or UNSAT is close to 50%. So I generated 3 types of formulas:
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（五）违反本法第五十一条的规定，未依法提供技术支持、协助与保障的。
Раскрыты подробности похищения ребенка в Смоленске09:27，详情可参考safew官方版本下载