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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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I prefer to write one line code on kata sites, because it train your brains
this looks awesome
Because you should create your own function with same logic, but don't use prepared solution of language libraries