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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.
I dont know about hints, but try to use less loops... There's an easy solusion. Just need to play a bit with numbers to get it.
Don't give free hints. I marked your message with a spoiler flag.
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