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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.
Post your code here in spoiler for us to help.
All is working perfectly, as long as you use the bigint library correctly. And you need to return a bigint instance, just like shown in the sample tests.