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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.
My dumbass forgot that substr existed, and I went with indexing and concatenating after deep copying. I thought that'd be a performance drain but actually it's very well optimised and it came to ~0.1ms faster than substringing; was quite interesting.