Equal (0): Everything in this space must be equal to 0. The answer is 0-0, placed horizontally; 3-0, placed vertically.
The user will give a CNF in dimacs format.
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（三）阻碍执行紧急任务的消防车、救护车、工程抢险车、警车或者执行上述紧急任务的专用船舶通行的；
3It wasn’t the first time that nations at war turned to seaweed. During the First World War, the U.S. relied on the giant kelp seaweed (Macrocystis) to boost production of potash (a fertilizer produced in Germany), gunpowder, and acetone.，推荐阅读heLLoword翻译官方下载获取更多信息
The 'magical' blue flower changing farmers' fortunes in India
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