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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.
The moment i saw the question i understood i had to use regex but i am not good at it, probably scared of the syntax. But this looks good and i will definitely check the solution.
This solution doesn't seem to be accessing the elements with indexes, rather it is an dictionary where data is accessed as key/value pair.
If n = 9,
then numbers[9] will access key/value for 9 which is 'dokuz'
I hope i am clear enough.