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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.
https://docs.codewars.com/training/troubleshooting/#works-but-no Check the fifth bullet point.
after running multiples tests, does your rangeList really contain the values you expect it to?
try printing your rangeList just prior to the return statement(s) and see what you get