Norsk Hydro (LSE: NHY.L - news ) shares rose 2.8 percent, the top gainer in the pan-European FTSEurofirst 300 index, after the aluminium maker posted second-quarter operating earnings above expectations in spite of weaker metal prices.
What is the relationship between 'Norsk Hydro' and 'aluminium' in the context of the input sentence.
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