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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.
It probably should, but I believe that was not the point of your original remark.
I'm not aware of any errors. Correct solution passes tests just fine.
Which test did fail for you with that 'expected result'?
The default test - the only with the above dataset - doesn't include result validation.
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