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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.
it should be fixed, but you may have to reset the sample tests
Initial solution fixed. Click 'reset' if it doesn't appear.
Managed to fix it by adding public modifier to class Reflections:
public class Reflections{}
I had to squint at it a little bit but the description did guide me as to what I should do. Compared to some other descriptions of kata this one is rather straightforward.
I agree, the description is very confusing.