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:
Москвичей предупредили о резком похолодании09:45，详情可参考体育直播
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Article InformationAuthor, 丹尼爾·布希（Daniel Bush），这一点在WPS下载最新地址中也有详细论述
Jacob Panonsand