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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.
Its not? There just arent big enough test cases to see a difference. Try
triangular 100000000 `shouldBe` 5000000050000000for example.This comment is hidden because it contains spoiler information about the solution