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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.
Your code is incorrect; unfortunately the pre-loaded basic tests have been badly thought-out and aren't general enough they are allowing your incorrect solution to pass because they are so specific.
It seems that your code currently is summing
aandbrather than summing all the integers betweenaandb.