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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.
Here, + refers to tooth since the question assumes ends of every comb are guaranteed to be a tooth.
comb1's last 4 characters "..++" can align with the beginning of comb2's 4 characters "++.."
comb1 and comb2's lengths add up to 16, which if you deduct the 4 units overlap amounts to 12