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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.
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Sorry, there are no errors in the tests. Before posting issues look at the top of the page: 612 people passed the Go kata; if there were errors somebody would have seen them before you.
You can read this to have some help: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution
Cheers.