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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.
Already raised as an issue
Your code has nested loops, that's not fast enough when the list has 10,000,000 elements. Use a faster algorithm.
looking at your solution, it may have been a bit unnecessary.