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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.
yeah, the same issue.
prior to this I had another error (incorrectly implemented comparison method) and substraction test passed successfully :), I corrected it and got this error.