Implement the Blinn-Phong specular term (instead of the original Phong specular) in the Phong shading (no need to do it for Gouraud shading) from the previous exercise. 

In the Blinn-Phong specular term you need to use the half-angle vector $h$ that is between the $l$ and $v$. The dot product is taken between that vector $h$ and the surface normal $n$.