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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Раскрыты подробности о договорных матчах в российском футболе18:01
消費税減税 国民会議での論点は 専門家と考える【経済コラム】