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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.
No need, they're both identical anyway.
fixed some time ago
The code is executed on Codewars' servers; you should not need to install anything. It's possible the servers are busy, or you have inefficient code (infinite loop?)