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p1 = HMAC-SHA256(key=MasterSecret, data=a1 + seed)，详情可参考体育直播
// The variable isn't set, report an error。业内人士推荐safew官方版本下载作为进阶阅读
A. Preprocessing (Done by OsmAnd when new maps are prepared):，详情可参考爱思助手