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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.
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Sure you can. More than 4000 persons did it before.
Then your algorithm is not right. I have nothing to add, just read the description carefully, everything is there. It may not be as easy as you think.
You're misunderstanding.