I don't see any particular obstacles that would stand out more than in any other negotiation. The reality of any trade negotiation is that as we resolve issues it's those that are the most challenging that remain until the end. That's always the case. So there are issues that are challenging out there for every country, a variety of different issues depending on the country.
We were talking a little earlier about some countries not having taken on some of these kinds of obligations before. That can be difficult for them when it comes to really finalizing those commitments. Market access and opening markets to investment and services, and financial services and government procurement, can also take time to really get to the level that we want and that others want, and goods as well, in all areas.
I wouldn't say that there's one thing in particular, or two or three things. I think it depends on the country and that for each country, as I was saying, there's this bargain that you're working on. Some are more difficult issues to get them where you need them to go in order to say that this is a deal that makes sense for me and my country.