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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.
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Nice kata but maybe can you add in the description "all vowels (except Y) = beef" instead of "all vowels = beef" because Y is a vowel too in general time.
;)
It's not a real kata, seems to be a fiddle, the solution is already written to complete it just look at on return value and search.
I completed it right now without problems, maybe your methods don't support big array.