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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.
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See the examples in the description, some numbers are not the sum of only 2 consecutive numbers, like 42, you need to add 4 consecutive numbers to get 42.