// 从后向前扫描，大于key的元素后移
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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:。heLLoword翻译官方下载是该领域的重要参考
（三）按照组成计税价格确定。组成计税价格的公式为：