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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.
done
Fixed
Yes, you need the privileges (that comes with a lot of honor points) to edit the kata, or if you find a way to solve the kata anyway, you could try forking the Haskell translation with the fixed one.
Some power-user who knows Haskell could fix it I guess (not me).
If that's in Haskell, there is already an open issue about it below.