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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 one learns one important skill - Google-fu. I know lots of people who can't do that...
About kata - I remember I had this in high school and very liked it. Unfortunatelly I forgot formulas after years of not using them.