 So you don't know what in front and polygroup does. Not a problem. This is the exact same thing as in front with an additional polygroup constraint. So it'll apply an action to everything in front of the polygon you click that is the same color as the polygroup you clicked. So if we start with blue, the only faces that are in front of this one that are also blue are gonna be activated. If we click on this face here, even though it's not connected, all the faces that are the same color are gonna be activated. So just remember, everything that is the same color and in front of the direction the polygon is facing are gonna have the action applied. Hope that helps, and as always, I hope you have a fantastic day and I'll see you around.