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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.
So you remove n from the list, making it smaller so now iterator moves +1 index and starting a new iteration it moves another +1 index. So therefore if you have two back to back not len(4) values you are skipping the second one