X = 12;
Y = 12;
N = 13;

end_points_start_x = [4, 2, 6, 9, 2, 8, 1, 4, 4, 8, 3, 9, 7];
end_points_start_y = [8, 2, 6, 8, 11, 10, 4, 4, 3, 2, 5, 4, 5];
end_points_end_x = [10, 5, 6, 11, 11, 10, 7, 7, 4, 11, 5, 12, 8];
end_points_end_y = [6, 4, 9, 11, 9, 10, 12, 9, 5, 8, 6, 9, 3];