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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.
But you found it. Don't kick yourself too hard. Computers aren't only used when you know the full formula. They're also used to discover formulas, work around the unknowns, or bypass the tedium. In this case, you didn't readily know the formula but were still able to solve the problem.
It's serious :)