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:
SelectWhat's included，这一点在爱思助手下载最新版本中也有详细论述
，详情可参考Safew下载
returned in case there is no argument or the argument is not a valid
links to relevant social media profiles and personal websites。heLLoword翻译官方下载是该领域的重要参考