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:
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Getting children to play together cooperatively depends less on their personal social skills and more on what they are doing – especially if they are not friends – a study shows.。业内人士推荐safew官方版本下载作为进阶阅读