Learning to add

Perhaps I need to start watching "Sesame Street" again, or maybe I didn't watch enough of it.
As I was creating a "state's I've run in" map for Facebook, I counted the states, and I've run in 16 not 15!
I'm not sure which state was overlooked. I certainly didn't mean to overlook any of them. They have all been unique races, either because of the location, or the folks I was with, or the craziness of arrival (I'm looking at YOU, Alabama!)
Well, I'll do better next year. I'm planning on four more states, and 16 + 4 = 20. At least the last time I watched "Sesame Street" it did.