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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.
Not sure about js but I experience the same in python. The system has a prompt about that, and it is usually because our codes are inefficient (it takes too long for the algorithm to process the questions). You just have to simply refine your code, though that is still challenging.
Don't mind the late reply, but yes, especially when you will be using the range() function