list at this point is ______________________________________le 1 0 le 3 2 le 0 15re 1 2 re 3 4 re 1 2se 1 0 se 3 4 se 0 2le 3 2 le 0 15 le 15 14re 4 5 re 4 5 re 4 5se 4 2 se 2 15 se 15 5le 15 14 le 14 13 le 14 13re 5 6 re 5 6 re 6 7se 5 14 se 14 6 se 6 13le 13 12 le 13 12 le 13 12re 6 7 re 7 8 re 8 9se 13 7 se 7 8 se 8 12le 12 11 le 12 11 le 10 9re 8 9 re 10 11 re 8 9se 12 10 se 10 11 se 10 9______________________________________ at this point the system has processed all of the vertices and are done with the trapezoidization phase of the decomposition the trapezoid entries above that are in italics are the trapezoids that found diagonals fig5 shows the polygon drawn with the diagonals fig6 shows a flowchart of the classify vertex method called from fig2 referring now to fig6 after entry block 602 determines whether one of the edges connected to the vertex is horizontal if neither edge is horizontal block 602 goes.