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:
Keep track the history of the keyword to determine when a keyword is rising or down in popularity over time.
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different things, or if Wikipedia is simply wrong. One of the little mysteries，这一点在服务器推荐中也有详细论述
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