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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Jim Lovell had been to the Moon twice, witnessed Earthrise and narrowly avoided a cold death in space - and saw no reason to falsely burnish his résumé.
第八十七条 鼓励涉外仲裁当事人选择中华人民共和国（包括特别行政区）的仲裁机构、约定中华人民共和国（包括特别行政区）作为仲裁地进行仲裁。