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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.
It is not exactly the same. The difference is whether adding to sum the input number or not. But that difference doesn't make it any harder or easier at all
No, 'y' is not a vowel in this kata.
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