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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.
Fixed.
In my opinion, this is a bug in the test,but as a temporary solution, you can try to select the mono 4.2.3 version in the editor (not c# 7.3, 8.0).
YAMTFT the kata is not only about pythagorean triangles.
You are apparently missing the fact that you can make a triangle with sides of 5, 7 and 10 units.