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:
Every route is registered to a dictionary like this:
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圖像加註文字，謝展寰告誡飼主給狗隻餵食人類食物「風險很大」。香港動物權益及福祉協會主席賴嘉敏律師指出，同樣基於選擇，食環署的立法建議表明，獲簽發牌照加註的餐廳將在門口有清楚標識，不喜歡寵物，或者對寵物毛髮過敏的食客，不應強行進入。
ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45