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空集合 / くうしゅうごう : n 1）(math) empty set 2）null set
空豆 / そらまめ : n 1）broad bean 2）horse bean 3）fava bean
空返事 / からへんじ / そらへんじ : n vs 1）absentminded response
空輸 / くうゆ : n vs adj-no 1）air transport P
空転 / くうてん : n vs 1 1）racing (an engine) 2）idling (an engine) 2 3）arguing in circles with no result P
空軍力 / くうぐんりょく : n 1）air power
空軍 / くうぐん : n adj-no 1）Air Force P
空軌道 / くうきどう : 1）unoccupied orbital 2）vacant orbital
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空集合

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