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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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the kata description already mentions this detail
I think the instruction is missing a rule for method beging 0 and the distance to the nearest number is equal in both directions.
It seems to be, that in that case, the smaller of both numbers should be chosen.