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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 thought about it later again...
It definitely depends on your goal for training.
If you want to learn libraries, go for libraries.
If you want to learn to program algorithms, then go for that.
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