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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.
In description said, that spaces will be presented only in case, where will be several words, but in test data there was string only with 4 spaces " ".
So test didn't match the description.