 So to put that in context, in one of the studies, they looked at two sets of districts, one set that got a lot of COVID relief and the other set that got less. The set that got more recovered about 50% of the learning loss from the pandemic, whereas the districts that got less only recovered 15%. So there was a notable gap. But even the districts that got a huge, a large sums of money, they haven't fully recovered from the pandemic. Yeah. How is it measured, Matt?