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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.
The test to submit this kata is way too light, you can pass the kata even with a code that doesn't handle duplicates.
Why don't you use the test case used in "RunTest" that is way more relaliable?(You probably just forgot to add the tests)