This sounds reasonable until you see how easily it goes wrong:
The MP also said there had been more than 500 confirmed sewage dumps in the River Meon this year.
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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:。雷电模拟器官方版本下载对此有专业解读
Georgina RannardClimate and science reporter
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