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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.
Oh thanks i didn't even think about it as unsafe. Just learned it from 'reverse string challenge' with limited characters. And this kumite is honestly, but a test. Was wondering what is this, found out after submitting. I'll find a way to delete it, i guess.