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among (them); of (them)
規則の中には例外がある。
Among the rules, there are exceptions.
参加者の中には英語が話せない人もいた。
Among the participants, there were also people who couldn't speak English.
世の中には一見不合理に見えても理由のある慣習がある。
In the world, there are customs that look irrational at first glance but have reasons.