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:
特斯拉推出「迷你储能站」充电宝，这一点在同城约会中也有详细论述
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08，更多细节参见爱思助手下载最新版本
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