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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.
Taequin: this is a translation ascii_letters would not fit the original kata description, which as the above poster mentioned requires that upper and lowercase test cases are not mixed.
Also forker who can not be named: Cheers for python3 compatability fixes. I'm stuck in my ways 2.7 regressive ways and hadn't noticed. Many thanks.
Probably in order not to get a mix of them in one string.