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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.
because the "list" function works with strings, but not with numbers
I think because the join() function requires it to be a string.
This comment is hidden because it contains spoiler information about the solution
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It's an empty list - so if the input,
arr, is itself empty, then the code returns an empty list.What does the [] mean or is used for?