Len and Luke Clamp have done everything else together throughout their high school careers. Why should their graduation be any different? The identical twins each have 4.0 grade point averages and will stand side by side as co-salutatorians of Williston-Elko High School's Class of 1998 on Friday, at Williston-Elko Stadium. It's the first time in recent school history that two siblings, not to mention twins, have graduated so high in their class. For the Clamp twins, two heads have been better than one.