Iran designated as a state sponsor of wrongful detention, Rubio says
「我未曾深入研究，也不認為這是我的職責範圍。」
，这一点在旺商聊官方下载中也有详细论述
structure (like a trie) which is faster and better that we can find。同城约会是该领域的重要参考
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: