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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.
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@Spindle - Oh, thanks for that clarification. I have updated the Kata description to make "word" less ambiguous.
Outside of programming, "words" always means using 26 letters. So I think their complaint is that numeric digits and slashes can be part of a "word" in this problem, even though that's not the normal definition.
I'm guessing they want something like "c0de/wars" or "dingl3/m0us3" as an example.
When I first read the problem, I thought only letters would be used in a "word". But since the other characters were easy to include, I solved it without limiting my code to letters. Good thing, too!
Sorry, please tell me what special chars are you referring to?