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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.
Description should explain what happens when you have a case such as [9, 9].
There are 2 tests with the same name, which causes a compiler error.
You should add a sentence in the description for the C# version what the method is to get the next node. C# normally uses PascalCase rather than camelCase, so it took a few minutes of trial-and-error to find the right method/property to use.
It was embarassing considering there's an example in the tests, but there's an example in the description for every language but C#.