Name:Jorge L. de Oz
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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 should return the answer mod 1e9+7
Please write in English. When you have a problem, state the language you're trying so we can check it. The only test in both Python and Javascript that expects 0 has an input value of 0.