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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.
Exactly what it says: 'int' object is not iterable.
If you do not understand the term
iterable, do not create an issue on this kata, but educate yourself. I don't know if it's the correct language (you don't even mention), but try this: MDN on iterables.Closing.