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:
主干道被乱停的车辆堵得水泄不通，路边散落着蔫掉的菜叶和塑料垃圾，地面上散布着不少干涸的痰迹。街道的脏乱仿佛成了一种默许，违停与垃圾不再被视为问题。鸣笛声此起彼伏，人们谈论的多是家长里短，而非“头上的星空与心中的道德律”。在这样的环境里，我们也不自觉地爱上议论是非、拆解他人。，推荐阅读heLLoword翻译官方下载获取更多信息
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Hunter said: "They were very fierce animals to face in the hunt, so the symbolism of the boar is a lot about the strength of it - a very appropriate adversary in battle."