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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 glad to hear that you find it useful.
BTW, if you want to push things further, there are two other (harder) katas that can be solved with a similar approach:
There's even a more general one, but that one is out of my league for now.