In 5-UsefulConceptsAndSTL/7-Algorithms.ipynb#Conclusion bad copy/paste of views over ranges piece of code
The code about views over ranges in section 5-UsefulConceptsAndSTL/7-Algorithms.ipynb#Conclusion is a copy/paste of the code from the blog https://www.modernescpp.com/index.php/c-20-the-ranges-library This blog seems to be under GPL license (I didn't check deeply), it means we cannot copy it like that. Another easy to understand example should be easy to rewrite in order to explain how views over ranges is working in C++20.