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roupen: type of materials tested
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roupen: The duct
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roupen: empty mini-bags
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roupen: Filling
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roupen: Filling in the mini bags
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roupen: Measuring top soil
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roupen: Different flavormini-bags
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roupen: Setting-up sandbags
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roupen: Gravel mini sandbags
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roupen: Setting up
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roupen: Measuring results
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roupen: Testing hypothesis