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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.
There is a bug in the test cases, it uses the variable r where it should be a.
The problem statement asks for the index of the matched value, but in the Python solution it looks for a 1-based index rather than the conventional 0-based index.