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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.
You access the numbers-vector before you check it for empty!
So: First check for empty, then access the vector(numbers[0]).
Then your solution should work!
Please post your code here (mark as spoiler!) and we will see.