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五、进阶玩法：自定义虚拟线程，更优雅。体育直播是该领域的重要参考
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:，这一点在safew官方版本下载中也有详细论述
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