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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.
There are IRL situations where 00009 could be an expected input but 00010 would not be a valid result, if you were mediating between two APIs is just one example. Situations where requirements will not always be explictly stated...