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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.
At least, in C++, could use a callable that someone would modify (function pointer or std::function<> of some sort).
Nice idea for a hakathon, IMHO bad idea for this codesite.
Note: Had the ability to edit: should have delete :-(