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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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This isn't an issue. An issue is a bug with a kata. This problem is caused by your code. Your code crashes when the input is an empty vector.
It mentions 3 different input values in the description and it shows 3 arguments in the initial code, could you clarify what do you mean?