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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.
@kuminin then how would you add the two strings if you don't parse them?
I'm guessing you're parsing the given two numbers and adding them together. What if the given string had a length of a million? It wouldn't be possible to just parse them and add them together.