X = 12;
Y = 12;
N = 10;

end_points_start_x = [4, 3, 8, 2, 2, 6, 1, 1, 3, 3];
end_points_start_y = [6, 9, 11, 11, 7, 10, 9, 8, 5, 6];
end_points_end_x = [8, 6, 11, 9, 8, 10, 5, 11, 10, 9];
end_points_end_y = [7, 6, 8, 9, 10, 6, 8, 7, 3, 4];