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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The Shark UV Reveal features expert obstacle avoidance that rivals that of the Mova Mobius 60 and is better than the Roborock Qrevo Curv 2 Flow. This robot senses edges, objects, floor types, and environmental changes in real life, using AI to navigate your home and, when applicable, even navigate over obstacles. The robot uses on-device AI and processing, making it more future-proof than some competitors. ，这一点在Line官方版本下载中也有详细论述
Six planets will parade across the sky this weekend in a rare celestial spectacle, experts have said.
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