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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.
Oo
It could be made clearer. If I were to rephrase it ( which I think I will ) I would ( will ) put.
"A single call should return the number passed in"
Does that make the meaning clearer?
It's because there aren't any permutations: we only care about the hypotenuse (longest side). Swapping the two short sides creates a mirror of the triangle, but it's type remains the same.