digraph G {
  /* splines = false; */
  node [ shape = "circle" ];
  /* c0 */
  /* c1 */
  /* n0 */
  /* n1 */
  /* n2 */
  /* n3 */

  /* n0 -> n1; */
  /* n0 -> n2; */
  /* n0 -> n3; */
  /* n1 -> n2; */
  /* n1 -> n3; */
  /* n2 -> n3; */

  /* /1* c0 -> c1; *1/ */
  /* /1* c1 -> c0; *1/ */
  /* n0 -> c0; */
  /* n1 -> c1; */
  /* n1 -> c0; */
  /* n2 -> c0; */
  /* n3 -> c0; */
  /* n3 -> c1; */

  c0
  c1
  c2
  n0
  n1
  n2

  n0 -> n1;
  n0 -> n2;
  n1 -> n2;

  /* c0 -> c1; */
  /* c0 -> c2; */
  /* c1 -> c0; */
  /* c1 -> c2; */
  /* c2 -> c0; */
  /* c2 -> c1; */


  n0 -> c0;
  n0 -> c2;
  n1 -> c1;
  n1 -> c0;
  n2 -> c0;
  n2 -> c2;
}