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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.
Good catch. Strange that no test cases caught that.
you can't remove items from a list that you are itterating over. need to create a copy of that list. (NOTE: copy, not simply set c = a, cuz that will just point to the same list twice.