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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.
If
numberscontains duplicate values,.index()will always return the index of the first occurance, messing up your results. There are easier ways to keep track of indexes with built-ins in Python.already fix it
This is literally what this challenge asks you to figure out :)
You can try to write some small values on paper and see if some patterns emerge.