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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.
First, this comment should not be in this discussion. It should be in the discorse of that kata. (As spoiler content)
And a hint to your problem: Is {1,1,2} a triangle? Your solution return true.