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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's still backwards, not fixed. Here's how it reads at this point in time (Dec 2022)
Given a mixed array of number and string representations of integers, add up the non-string integers and subtract this from the total of the string integers.
Thanks for this clarification. Hopefully the description will be updated.