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The average energy bill for millions of households will fall by £10 a month in the spring, after Ofgem said the price cap would fall by 7% owing to a shake-up in green levies.。关于这个话题，safew官方版本下载提供了深入分析
Алексей Гусев (Редактор отдела «Спорт»)
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: