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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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That is true. Name of function is misleading then. Thank you for the reminder.
Your function
is_vowelshould return true when it finds a vowel instead of false