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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.
I'm having the same issue you had (only failing the first 3 tests). I recognize that each of these 3 VIN numbers have "X" as the checker digit, yet I still cannot figure out what I am doing wrong. Can you help explain to me how you were able to solve this?