And if you look at all this academic work in the conferences...

And if you look at all this academic work in the conferences and so on there's a constant theme that terrorism is extremely hard to define and we therefore have to have a deep thinking about it. And the reason it's hard to define is quite simple. It's hard to find a definition that includes what they do to us but excludes what we do to them. That's quite difficult. So it takes a global war on terrorism.