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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.
literally had to use list of prime numbers up to 10000
idk how to do it in other ways
didn't think about that when i had a solution in my head
wow! That is really smart to use the ASCII number, But still that is what isupper() does. Nice one!