lucy24 - 10:37 am on Mar 21, 2013 (gmt 0)
You don't need the Allow lines at all. They're only for identifying permitted areas inside of excluded areas-- and then only for robots like googlebot that recognize the word.
In robots.txt, simpler is better. If you don't say anything about the adbot by name, it will follow the same rules that apply to your generic robot
If some areas of your site are blocked to most robots, but you want the adbot to go absolutely everywhere, give it a separate line that says
Just like that. Nothing after the word "disallow".