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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 have to check first if array1 or array2 is falsy like None or an empty array.
It is at the end of the instruction
A problem with your code is not a kata issue. Read this: https://docs.codewars.com/training/troubleshooting post your current code.