This is not the only surprise in this article.
A week later, everything cleared. Almost a month later, still no issues.
。业内人士推荐搜狗输入法下载作为进阶阅读
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:
Indonesian GP — Oct. 11