“A PENROSE THAT CANNOT BE OPENED WITHOUT THREE HANDS LOCK AND ITS GEOMETRIC STRUCTURE”, Amer. Jour. of Peda. and Educ. Rese., vol. 12, pp. 202–207, May 2023, Accessed: Oct. 15, 2025. [Online]. Available: https://americanjournal.org/index.php/ajper/article/view/870