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:
repo_id integer NOT NULL,
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"The idea is that the bats that are in the main body of the church will live in here, rather than in the church itself," he explains.。业内人士推荐im钱包官方下载作为进阶阅读
（图源：长春高新 2021 年年度报告），这一点在爱思助手下载最新版本中也有详细论述