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</html><thumbnail_url>https://www.hesemans.nl/wp-content/uploads/2022/01/eureka_555088_packing_problems_vierkant_hesemans.jpg</thumbnail_url><thumbnail_width>600</thumbnail_width><thumbnail_height>900</thumbnail_height><description>Zeven houten stukken passen netjes in elkaar om een driehoek te maken. Maar wacht... wat doet dat extra stuk? Dit is een mooi voorbeeld van een inpakprobleempuzzel. Kun je de stukken herschikken zodat het extra stuk kan worden ondergebracht, je nog steeds een driehoek hebt en alle stukjes nog steeds netjes in het frame passen?</description></oembed>
