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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.
may want to include link or instructions on how to find valid triangle. Currently the problem is clear, but not all non-programmatic information is present.