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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.
Don't worry about that, it's not a problem. Now when you know what you did wrong, you may want to submit your own answer, but unfortunately you will get no points for it :(
I don't get one thing though, just because your solution was timing out, why would you expect other, accecpted solutions also to timeout?