二二八79週年掀「台灣史補課潮」，新生代如何與歷史對話？
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。关于这个话题，WPS官方版本下载提供了深入分析
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:，更多细节参见safew官方版本下载
圖像來源，BBC Chinese / Lok Lee