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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.
It may look overkill for advanced users, but it's actually good for programmers who's still studying.
This is deliberately overkill; it's an explanation of available OOP class features with scoping.
Tortoises are tired before 24h:-)