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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 instructions are misleading. It says that all numbers in the list must be greater than zero, so there shouldn't ever be a result that zero is the smallest number you can insert to make the sum prime. If you're inserting the solution into the list, it only makes sense that the solution can't be zero.