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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'm afraid I don't know the under-the-hood aspects of sort as well as I'd like, but it does seem to sort numbers by default.
I also realized that it should probably be i <= 100, just for the outlier situation of having 10 arrays of 10 elements covering numbers 0-99