扫描身份证，查询参保信息，打印参保证明……在河北三河市政务服务燕郊中心，市民王先生用了不到1分钟，就在自助服务终端机上打印好北京参保证明。
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Cluster & Border Point Definition: The map is divided into clusters, and border points are identified using the Ford-Fulkerson based method.
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