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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.
The author stated in some other comment that due to a bug multiple paths between 2 points may exist. Neither this bug got fixed, nor did the description get updated to mention this bug.
This has now been specified.
It's not the most efficient way to kick out, but the stack isn't very big in JavaScript, so the recursive calls throw an exception fairly quickly.