I'll let Anthony talk a bit more about how we define product markets and what we take a look at, but we don't actively, I would say, monitor specific industries, because our law is general application law. We take a look at cases when they come through the door and we do a thorough investigation based on the facts that are given to us, but we don't actively monitor on an ongoing basis.
That being said, as I mentioned, in the context of a merger, to the extent that we've authorized a transaction or provided a “no action” letter, there's a 12-month period in which the bureau could decide nonetheless to review, but there would have to be material information that would suggest that the analysis or the competition analysis has changed or that there are new facts that we weren't aware of at the time of our review to get us to reopen a transaction.
That being said, I'll let Anthony speak to how we define specific markets and what we determine to be competitors or not be competitors in a given case.