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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.
Randomness. There were only 7 tests to pass, so since it is a 50/50 shot, it would be expected to take 128 attempts before it returned the correct result for each test. Either this person got lucky, or this person is very patient.