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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.
"end" means the final digit, not the initial one. you mean "extreme", but I'm still searching for a better word.
characters aren't numbers, they're digits
Testing does not adequately test for randomness, and does not give useful feedback.
Note that testing for randomness is hard.