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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.
You need to improve your random generator. Expected values are too predictable.
Flip a coin, if it's heads generate a random nmber, otherwise, generate a random Kaprekar number from your list.
That way, expected values will be unpredictable.