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:
本次发布会的重头戏则是天籁·鸿蒙座舱 SS380 大师版和第 15 代轩逸两款新车。
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那时他在香港做土木工程，吃饭喝酒谈生意，免不了在夜总会挥金如土，客人与小姐之间照样规规矩矩，彼此尊重。
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Last week, we missed that Shoresy Season 5 had arrived on Hulu. My sincere apologies, as this show is perfectly suited to snowy days and frustrating times. A spin-off from the hilarious Canadian comedy series Letterkenny, Shoresy takes the eponymous foul-mouthed hockey player (portrayed by series creator Jared Keeso) into new terrain: vulnerability. Think Heated Rivalry, with less sex and more "your mom" jokes.
"It's a big nationalist symbol, it's attached to sovereignty. Would the Venezuelans be willing to do whatever the US says and roll over? I don't think so."，详情可参考同城约会