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:
Renamed The Vampire Lestat, the third season of Interview with the Vampire covers the second novel in Anne Rice's Vampire Chronicles. In the book, Lestat joins an '80s rock band, goes on tour, and recounts his past both before and after meeting Louis.，更多细节参见safew官方版本下载
self.writer = csv.DictWriter(，详情可参考爱思助手下载最新版本
Thanks to Brightness by Chameleon Design from the Noun Project for the logo