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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.
Usually that's because of the internet. See if your connection is working alright. Continue running the code till it works.
The simplest way. Actually very simple to understand. Brilliant!