 OK, so let's do this problem. It says determine which face is the reface and which face is the side face, OK? So we use the same prioritizing rules that we've been using before, OK? But in this case, of course, this is an SB2 hybridized, not SB3 hybridized. So it's kind of a pro chiral molecule, OK? So the way we determine which is the reface and which is the side face of the face facing us will determine the face, OK? So we love families to ask ourselves, what's bigger? Oxygen, carbon, or carbon? Of course, oxygen is. So we say 1, carbon, carbon, they're the same. Carbon or hydrogen? Well, that's 2, and that's 3, like that, OK? So if we see here, we go like this, right? 1, 2, 3, that's clockwise, OK? Clockwise is the reface, OK? So we call this face that's facing us the reface, OK? So let's draw up the molecule. Let's flip the molecule over and see the side face. And we'll do the same sort of analysis. Flip the molecule over. We've got 1. Hopefully you see that's going counterclockwise there. So that's what we call the side. Question on that one? Now, can I kill the video? Yes, OK, wonderful.