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:
Related internet links Unpaused (Guernsey)，这一点在夫子中也有详细论述
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Hungry mothers and dirty wards - maternity care 'much worse' than anticipated, review chief says，详情可参考safew官方版本下载