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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.
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ah, I actually misread the assertion message you wrote. Well, print the inputs so that you can see what's going on when you encounter that failure. I'd bet on an error in your algo handling the actual number of "Wild".
"don't mutate the input"?
printis your friend. ;)