A duo may comprise a male.Logical formLearned from9 sentences. A duo may be based in a US-city.Logical formLearned from9 sentences. A (hip hop duo) can be from a world-city.Logical formLearned from9 sentences. A duo can be underground.Logical formLearned from9 sentences. A duo may undergo a breakup.Logical formLearned from9 sentences. A duo may have hits.Logical formLearned from9 sentences. A duo may record some songs.Logical formLearned from9 sentences. Duos can be vocal.Logical formLearned from9 sentences. An output may pertain-to a duo.Logical formLearned from9 sentences. A duo may explain that something-is-the-case.Logical formLearned from9 sentences. A duo may make an appearance.Logical formLearned from9 sentences. A duo may be separated.Logical formLearned from9 sentences. A duo can be a team.Logical formLearned from9 sentences. A female may make a duo.Logical formLearned from9 sentences. A duo can be on tour.Logical formLearned from9 sentences.