join unknown number of lists in linq

Question

I have a situation where I have generated a number of lists which contain integer values. However, the number of these lists is only known at runtime, and i

Answer 1

// lists is a sequence of all lists from l1 to ln
if (!lists.Any())
   return new List();

IEnumerable r = lists.First();   

foreach(List list in lists.Skip(1))    
   r = r.Intersect(list);

return r.ToList();