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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.
Nice, using hash set! Using a hash set for checking an element existence in a collection is the fastest way, but because the vowels characters are just a few, an array or list may suffices.
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