第二十一条 居民委员会成员可以向居民委员会提出辞职申请，其职务自居民会议或者居民代表会议审议通过之日起终止。
Владимир Зеленский. Фото: Valentyn Ogirenko / Reuters
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To find these crucial border points, we employed a clever technique based on the Ford-Fulkerson algorithm. By simulating "flooding" roads with traffic from random start/end points, we could identify the natural bottlenecks – the "minimum cut" in graph theory terms. These bottlenecks became our border points.
Tony Jolliffe/ BBC News