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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Your solution has a bug and it is not a kata issue.
Please run following line of code in your IDE:
print(f"My solution for n=4 is:\n{generate_shape(4)}")
and tell us the output.