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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.
How would your code know if the unique is the first item or the second one?
test your code with a vector that has only one element, see what happens. asking for help is a
question
, not anissue
btw ;-)