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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.
I really like this kata! Nice link with mathematics.
However, you could make it a bit harder by requiring the user (in at least one test case) to actually jump to an earlier node, as in start > end. I was able to pass this kata by just ignoring all the loops.