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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.
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Yes, I think creator of the kata is from US and isn't aware that others use somwhat inverse value.
You are right that L/100 km is a more common unit of measurement, but apparently it is not the goal of this kata, so this is not a typo.