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:
# What about other tools?
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At $89.99, the latest Go is the most affordable Polaroid camera available, with film that costs just a little more than Fujifilm’s Instax Mini shots (a 16-sheet pack runs $21.99). The new Go sports a few upgrades over the last-gen model, including USB-C support, and Polaroid claims the camera produces clearer stills than its predecessor. Photos are slightly brighter, though the original Go produced warmer images that felt more true to life. Still, the photos are charming in the way only a Polaroid photo can be. Contrast and color saturation levels are still low, but in a way that exudes the vintage, almost dreamy look of the photos taken with the Flip.
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