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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.
You are completely right. I just fixed this typo.
In the instruction you write gdc() and then gcd. I'm quite sure both of them should be gcd
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