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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.
Read the conditions in the description again. You have an infinite loop, and that's why your code times out.
Timing out is not a kata issue.