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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 made the same mistake I did on this one: it's not just that there's a triple in num1 and a double in num2, the double has to be of the same digit as the triple.