#include <CGAL/Exact_integer.h>
#include <CGAL/Homogeneous.h>
#include <CGAL/Nef_polyhedron_S2.h>
typedef CGAL::Exact_integer 
RT;
 
typedef Nef_polyhedron::Sphere_circle Sphere_circle;
int main()
{
  Nef_polyhedron N1(Sphere_circle(1,0,0));
  Nef_polyhedron N3 = N1 * N2;
  return 0;
}