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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.
If you add or subtract zero, the result will not change, but there will be no unnecessary operation.
I also summed it up with zero.
The most concise version!
The reason is people voted it.
Is there a particular reason why this is a good practice?
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can be combined as
(sort-by val >)