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BALK & KUBUS. LICHAAMSDIAGONALEN & DIAGONAALVLAK. KUBUS. BALK - ONTVOUWING. https://www.youtube.com/watch?v=R_cl1HHygGw. http://www.fdls.fr/archives/391. http://www.mathopenref.com/cube.html.
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LICHAAMSDIAGONALEN & DIAGONAALVLAK KUBUS BALK - ONTVOUWING https://www.youtube.com/watch?v=R_cl1HHygGw http://www.fdls.fr/archives/391 http://www.mathopenref.com/cube.html