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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.
This part of the instructions needs to be changed:
"Assume that input is array of integers."
It should be changed to "Assume that input is array of integers or an empty cell or a combination of both."