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These are not exactly the seeds, but the hull of the seeds of the horse chestnut. Image source: https://en.wikipedia.org/wiki/File:Aesculus_hippocastanum_fruit.jpg
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These are not exactly the seeds, but the hull of the seeds of the horse chestnut. Image source: https://en.wikipedia.org/wiki/File:Aesculus_hippocastanum_fruit.jpg