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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.
I also thought the same, so tested it with a string with lots of spaces and only a few characters. It returned false where it should have returned the hashtagged word.