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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 can only advise you to give a look to the mnemonic morse tree ;)
What an interesting and instructive comment, many thanks!
I had time to waste :p
This solution take me 10 min, and I discovered after that the morse code was based on a tree => lol.
So it's not so fancy, but it works, so why not?