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:
Churches have plenty of spots where the Natterer's bat likes to roost
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“魔法のつえ”が奪われた 最高裁Noで新たなトランプ関税は？
Testing Approach