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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.
It's the last of the fixed tests, not the random ones: it has an extra space at the end of the second line.
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This one was hard because I think I'm not quite grasping the math involved. I got something I'm happy with visually - but I can't quite understand what the shorter, better solutions are doing.
For some reason this passed the tests but shouldn't have: it started taking the fibs at 0, 1, 1, 2... instead of 1, 1, 2, 3...
Of the non-valid examples, why is "(56) 84 6 552" not valid?