# Next step: the ZX Spectrum
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:
。关于这个话题，heLLoword翻译官方下载提供了深入分析
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當局表示，相關法律針對叛國、分裂國家等行為，對維持穩定屬必要之舉；但批評者認為，這些法律被用來打壓異議聲音。，详情可参考safew官方下载
The pharmacy worker said she did not remember her first month in hospital, before she had her hands amputated，更多细节参见safew官方版本下载
Some economists say that more Dutch women need to work full time