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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.
Fixed. JS version were vulnerable to input modification.
Didn't look at your code, but I'll bet on you modifying the input array/list or whatever... ;) (always bad practice, just for the reason you encoutner now!)
Check: found it in your code! ;)