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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.
It would still error in python 2 as he said his list length is 2 and this is hard coded to 5.
This should simply ask how many times it passes the window and that's it. Returning -1 for cases when the answer is really 0 seems odd.