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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.
Agreed.
Agreed.
This compute the lower and upper version for each char before choosing one of them. The best practice way would rather be to pick the function and only then apply it (meaning, zebulan's solution, for example)