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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.
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Well, just need more logical thinking, first, what you need to do, then how to do it and you can search for the built-in functions.
I made this first if because if the first number was the unique didn't pass the test, but all the other test were passed, but with this first statement all is ok
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