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Aardolie<\ /a>

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Kerncentrales<\ /a>

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Waterkracht<\ /a>

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Zonnecellen<\ /a>

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Windturbines<\ /a>

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Recupel<\ /a>

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Computervirussen<\ /a>

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Microsoft Windows<\ /a>

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Internetproviders<\ /a>

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Bill Gates<\ /a>

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