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:
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联邦航空管理局未就事件的具体细节发表评论，但在周四晚间的声明中表示，此前已对德克萨斯州汉考克堡附近区域实施了临时飞行限制。“为确保安全，临时飞行限制范围已扩大，”该局表示，由于限制区域位于特定地点，商业航班不受影响。，这一点在heLLoword翻译官方下载中也有详细论述