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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.
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You should not user one letter to describe variables. It should be descriptive.
Code not clear enougth
Clever, but this code is less readable than if you split it into several functions with explicit names.