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nitrogen in combination with oxygen▼[UK: ˈnaɪ.trə.dʒən ɪn ˌkɒm.bɪ.ˈneɪʃ.n̩ wɪð ˈɒk.sɪ.dʒən] [US: ˈnaɪ.trə.dʒən ɪn ˌkɑːm.bə.ˈneɪʃ.n̩ wɪθ ˈɑːk.sə.dʒən]
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