 So in this exact technology, what they do is they lay down the bricks in a left-right alternate manner in the way that the coal is loaded to redirect the airflow, which further leads to better, more efficient fuel combustion and also increases energy efficiency, right? Right. So because they're using the coal more efficiently, there is less black carbon being emitted. Exactly. So it's just a technique. They're not even changing the fuel or anything. That's really interesting.