X = 10;
Y = 10;
N = 9;

end_points_start_x = [1, 2, 6, 7, 4, 2, 6, 5, 3];
end_points_start_y = [1, 1, 3, 4, 6, 9, 5, 8, 9];
end_points_end_x = [9, 9, 10, 10, 9, 6, 6, 8, 8];
end_points_end_y = [1, 2, 8, 7, 9, 4, 8, 7, 6];