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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.
:-) note the fmt::join up there is IMHO canonical in the 21rst century..
Know your STL and get rid of those for loops.
Finally, the universal C++ solution after 16 months of the original kumite. (15 months since my C++ translation.)