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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.
Execution Timed Outmeans your solution is not efficient enoughits not 'not fair', your solution is just not good enough right now
Well, your message is quite vage about why you fail or which error message it displays. Mine failed because of the wrong usage of variables which differs from this environment to your local one.
you can learn more by reading this
Tests have evolved since