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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.
In the language of your choice, there is a sort method that normally sorts alphabetically ascending, so "810" comes before "90" as "alpha" comes before "beta". If you were to sort them as numbers, 90 is less than 810 (that's not what you have to do). Better now?
"810" comes before "90" because "8" comes before "9" as a string, does that help?