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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.
I see quite a few solutions along the lines of
Added value would be if you rejected those solutions. Because this
is perfectly servicable, and, unlike the above, does not indicate you do not understand your data types.
What happens to non-positive side length?
This is a duplicate of https://www.codewars.com/kata/is-this-a-triangle