Израиль нанес удар по Ирану09:28
1. 根据数据范围创建若干个桶
，详情可参考heLLoword翻译官方下载
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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:，更多细节参见heLLoword翻译官方下载