Name:Hayk
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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 are not supposed to return 0 (an integer, which is not iterable, as the error says). You are supposed to return two lists.
At least once, means one or more times.