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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.
Very good kata, it made my cry but i could do it.
Here having the same issue. Where did you put "new HashMap<>()"?, in the beggining of the interpret method?