• 四个一组sì gè yī zǔ quaternion, quaternity, tetrad
• 四人一组sì rén yī zǔ quaternion, quaternity
• 四元数sì yuán shù quaternion
• 双shuāng two; double; twin; both; dual; pair
• 双的shuāng de dual
• 双重的shuāng zhòng de diplex, diploid, double, dual, duple, reduplicate, reduplicative, two-ply
• 双重国籍shuāng zhòng guó jí dual nationality
• 亦工亦农 peasants; people's dual status as workers and peasants

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neoorthodox, neoorthodoxy, Neo-orthodoxy, neooxine, Neopaleozoic, neopallium, neopalynology, Neoparalaelaps, Neoparasitidae, Neoparasitus,

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3G, 401(K), a,