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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.
My first working solution didn't pass the final submit performance tests, but I came up with another working solution in the end. If you haven't gotten this yet since your post, I recommend looking up Dijkstra's Algorithm. Apply some of its concepts to get a solution.
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Usually, restarting the browser solves this challenge! lol
Normally you would client-side debug something and you'd see the source but you have to figure out how to remote debug since the source resides on the server.