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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.
Having the same issue, I don't understand the instruction. It says return '' if more than one possible pair of a,b values, yet the tests ask us to return two pairs of a,b values?
Edit:
Honestly, just ignore that criteria and anything about the amount of a,b pairs, just make a solution which returns the a,b pairs quickly and you'll pass.