“Clones”, as I’m sure you can guess, means in this case a model of coaster that has been rebuilt in the exact same way multiple times. If at least two of them exist, and their layouts are identical, then it counts. “Mirrored” coaster clones are fine (ie Wonder Woman + Railblazer) assuming the mirroring is the ONLY difference. But, for example Colossus at Thorpe wouldn’t count, because the newer Intamin 10 Inversion models are slightly different, and there’s 3 or 4 of them by now. So, taking into account theming, smoothness, etc, what are the best examples of such rides? Darien Lake’s Ride of Steel (now Superman again, I think?) would be my first vote.