There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
// 第二步：遍历nums1，从Map中直接查询每个元素的结果（O(1)查询，无需重复计算），推荐阅读WPS官方版本下载获取更多信息
Integrates with all other HubSpot content tools to help you create a well-rounded content strategy，这一点在safew官方下载中也有详细论述
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