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// 测试用例（可直接运行验证）
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Мир Российская Премьер-лига|19-й тур
In his simulations, it was extremely rare for someone to have their mutual first picks; but many people had those that were second or third picks. In this scenario a couple counts as happy if each is near the top of the other's list and neither can find someone they and that other person would both prefer more.