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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.
You could harden it such that you figure out which IP is greatest and swap the subtraction, but I believe the challenge rules laid out rules about the expectations.