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Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
，这一点在51吃瓜中也有详细论述
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:
{ 42, 56, 62, 52, 23, 7, 5, 17 },