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      They built an entirely sustainable house, generating its own power. 
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      densely - gęsto - The city center is densely populated, with over 10 000 residents per square kilometer. / His presentation was too densely packed with data. / The wood of this ancient oak is incredibly densely structured. 
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      filthy - obrzydliwie, nieprzyzwoicie - The man is filthy rich. He owns a castle. / You are filthy dirty. Take a bath. 
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