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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 could add more test cases.
Siim, sabia que tu nao esperava que ia ter pronto.. hauehuae
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Could require a different return for invalid inputs (e.g "return 0 for arrays with less than 3 integers or if the array is all odd or all even").