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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.
+1 to this guy, there is no such angle as 0.
You got your tests wrong.
I had to add to my if statement an equals in my solution to pass the tests : if((a+b)<=180).