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:
随后，几个“民警”团队轮番上阵，用多个陌生号码和龙妈妈联系，警告她：“案件保密，不能告诉任何人，尤其是你儿子。”接着，在视频通话中，骗子们出示了假警官证，假执法画面，一步步诱导龙妈妈配合“资金核查”，并要求她提供支付宝密码、银行卡号和密码。，这一点在服务器推荐中也有详细论述
。搜狗输入法下载对此有专业解读
Сайт Роскомнадзора атаковали18:00。业内人士推荐Line官方版本下载作为进阶阅读
精细化管控：支持分批、分级、按需迁移