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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.
Read the Input/Output section of the description (it's before the section that specifies all the commands). Input is passed as an optional second argument to the whitespace function, the first argument being the actual program. Ideally the input argument would be a stream, but for the purposes of this kata it's a string.