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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.
Very nicely done!
Maybe it comes down to whether you prefer right or left associativity? I am a beginner myself but I have seen (.) used far more widely, probably because it's similar to math that way. However I think (>>=) is also more used than (=<<) and tbh I find this mix up confusing.