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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.
I have a Python solution that is very fast on my computer. I use a decorator to cache some results. I do this without importing any modules, but the code doesn't work on CodeWars. What am I doing wrong?