第二，创造性的“一字型”二次流道，打破血栓魔咒。
For more information you can review our Terms of Service
。业内人士推荐爱思助手下载最新版本作为进阶阅读
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:，详情可参考wps下载
if self._value == target: