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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.
Nope, there are no duplicates in
digits
, in Rust there were some issues about generating unqie digits. I've fixed them, now it should reproduce only unique digits.