There will be 1,200 rapid screening assessments; there are the 500 that have been dealt with in very quick order. What we have then committed to is saying we will continue that process with those that are still left in the 4,000, the other 2,500 to 2,800.
We have also said to industry that we're happy not to have to wait to continue to do that. If you would like to take a look at those substances, come forward with data on those that will allow us to move more rapidly through that, and we will be able to move through this more quickly.
Right now the plan is to get through those 200 in the challenge program within three years. For industry that is willing to come forward to work on some of the other substances that have been identified—and industry is already stepping up, saying we don't want that stigma you've heard so much about attached to us; we're happy to look to negotiating how we can move away from these, to what timeframe. We're hopeful we'll be through this fairly quickly.