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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.
Good idea indeed.
Facing the same issue at this point, I am using recursion and I am passing every case up until 120 or so and then it times out. Did you manage to pass the kata?