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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.
I prefer the actual description
Not really an issue. More of a suggestion. It looks like you understood it well enough.
Where do you read "elements of integers"?
The elements are from the array.