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Цены на нефть взлетели до максимума за полгода17:55
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巨头在此押注未来十年的船票，创业者在此寻求第一桶金的现实回报，供应链在此等待新一轮的订单潮……
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: