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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.
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This link may help: https://docs.codewars.com/training/troubleshooting
You both are right but I supply all tests already satisfying the assumption so it was a typo. Thank you!
From the description:
Suppose the hate is mutual, so if Spiderman hates Captain America then Captain America hates spiderman.If you have 8: [11], you can assume 11: [8], even if 8 doesn't appear at the element 11.The error comes from your code. Use the error message to investigate what's wrong. This may help too: https://docs.codewars.com/training/troubleshooting/