Can some one explain what the !a does in this:<br><br><span class="keyword">data</span> <a href="http://cvs.haskell.org/Hugs/pages/libraries/OpenGL/Graphics-Rendering-OpenGL-GL-VertexSpec.html#t%3AColor3">Color3</a> a = <a href="http://cvs.haskell.org/Hugs/pages/libraries/OpenGL/Graphics-Rendering-OpenGL-GL-VertexSpec.html#v%3AColor3">Color3</a> !a !a !a<br>
<br><a href="http://cvs.haskell.org/Hugs/pages/libraries/OpenGL/Graphics-Rendering-OpenGL-GL-VertexSpec.html#t%3AColor3">http://cvs.haskell.org/Hugs/pages/libraries/OpenGL/Graphics-Rendering-OpenGL-GL-VertexSpec.html#t%3AColor3</a><br>
<br>Thanks,<br><br>Daryoush<br>