//get all combinations of 4 distinct points from the collection
foreach(getFourPoints in collection.AllFourPointCombinations()){

 //make two lines from the points
 line1=line(getFourPoints.p1,getFourPoints.p2);
 line2=line(getFourPoints.p3,getFourPoints.p4);

 //find the intersection of the lines
 intersection=line1.intersect(line2);

 //check if the intersection is not yet in the point collection
 if (!collection.points.includes(intersection)){
  //add intersection to the point collection
  collection.points.add(intersection);

  //add the lines to the existing graph of lines
  addToGraph(line1,line2);
 }
}