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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... A corner case. Means you should print the input to see what's your function is fed with and so you'll be able to understand why it fails.
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code( with correct indentation! ).It looks like JavaScript though, in which case:
console.logis your friend. Look at the inputs.