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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.
In the worst case with 170 balls, your solution actually needs 6 uses of the scale.
Hint: see what happens in your solution if the last ball is heaviest