// build up an object where each value is set to the full state of the register at the corresponding key
Крупнейшая нефтяная компания мира задумалась об альтернативе для морских перевозок нефти14:56
，详情可参考下载安装 谷歌浏览器 开启极速安全的 上网之旅。
他說：「當我們完成後，（你們）接管你們的政府。它將屬於你們。這可能是幾代人以來唯一的機會。」
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: