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:
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// 复制数组（避免原数组被修改影响其他测试）。关于这个话题，heLLoword翻译官方下载提供了深入分析
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