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:
就在几年前，这片土地上还是另一番景象。2018年，达博从美国回到冈比亚，子承父业，投身农业，却遭遇“迎头痛击”。“我空有一腔热情，但对水稻种植一窍不通。一开始，杂草比稻苗还高，灌溉靠天，收割靠手。虽然投入巨大，收获却寥寥无几。”达博说。
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Elahi, the UK's deputy government chemist, who is based at the measurement and testing services company LGC, couldn't believe that food fraudsters would target children.。关于这个话题，51吃瓜提供了深入分析