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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.
for link with id Q42 the description in en and en-us are different (en-us value is taken in the tests, although the instructions say to take the en value). Anyway kata is very interesting, first time working with the API :P