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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.
According to the description: "The longest word will never be greater than this width.".
What if 'str' contains words whose lengths are larger than 'len'?