I don't know whether it's common practice. I understand that, when certain resources are put on a contract and those contracts are in place for some number of years, they will move on to other jobs or not be available at the time.
I can't speak as to whether it's common practice. Certainly, if consultants or contractors aren't performing, that's a separate issue, and we would absolutely seek to remove them from the contract and have somebody else, so I would see those as two different issues, but I can't speak to the frequency with which that takes place.