// 易错点：升序排序会导致逻辑完全错误（无法判断后车是否追前车）
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:，这一点在WPS下载最新地址中也有详细论述
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