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:
В конце февраля аналитики Counterpoint Research заявили, что Apple и Samsung стали самыми популярными производителями смартфонов в Европе в 2025 году. В 2026-м специалисты предсказали спад рынка.
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Since I started using a treadmill at my desk, I’m addicted to walking. The inexpensive treadmill I have now overheats despite a cooling fan we added over the motor, an additional external fan, frequent dusting, and copious amounts of lubrication.
"message": "Amount must be non-zero."