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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.
Same! I was working on it for about 30 minutes trying to get it to work. One google search for 'sort by number then alphabetically' and, lo and behold, a stack overflow suggesting the hallowed LocaleCompare. Good stuff.