Customers had to pay a deposit for the sturdy glass bottles. They then got this money back when they returned them to the shop. And the bottles would be washed and refilled over and over again.
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:，更多细节参见同城约会
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Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
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