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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.
After doing this with 28 lines of code, this solution has blown me away. I never was much good at maths though.
Yup you're right the wording is incorrect. The wording strongly implies the result should be from s1 OR s2, which leads one to assume that it should be from whichever is the longest string. However it should be from combining both s1 AND s2.