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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.
To my understanding, when index 6 == '20' start comparing, from right there is no corresponding so that means it is equal to 0 based on description, and the sum to the left side is also 0, so i think that's why it shows index 6. Actually, i'm having a hard time dealing with this specific test case lol
Read the description again. Not a kata issue.