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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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Yes you are. Use the error message and search about this in the documentation of your language. Also please use markdown tags to format your code, or it's very discomfortable to read and, in Python, unusable. See there: https://docs.codewars.com/training/troubleshooting/
Why are you adding those additional quotes? Read this too: https://docs.codewars.com/training/troubleshooting
A problem with your code is not a kata issue, use question label next time. Your code is not returning for some values, print the input and figure out why.