greeting := "Hello, world!";
验证规则（对应测试用例中的优先级）：
В Госдуме призвали сажать нелегальных банкиров20:17，更多细节参见吃瓜
Sie haben bereits ein Print-Abo?，更多细节参见谷歌
ВсеПолитикаОбществоПроисшествияКонфликтыПреступность。博客是该领域的重要参考
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