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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.
How to do random tests
Thx. Updated. Hava a look.
Your solution is more correct. But it' s difficult to make a test because global before is out of reach.