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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 can really do the range from [1, number) since 0 will not have an affect on it at all (even though it is passes the check of being a multiple it will not contribute to the sum)