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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.
handled
that's actually your code that is incorrect (it's still missing some perfect squares), but the tests are badly written, that's why you get the error right in the assertion message.