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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're likely missing the null or empty string validation. OP solved it though, closing.
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Because when you have sticks with lenghts of 2 inches, 3 inches, and 4 inches, you can build a triangle out of them. But you cannot build a real triangle with sticks of lenghts 1 inch, 2 inches, and 3 inches.