 OK. So I guess we had a question on electronic structure. And so let's just go ahead and make a list of what the electronic structures can be and how you figure it out. So the way to figure out electronic structure is to look at the central atom and ask yourself, how many groups of electrons does it have around it or electron groups? And so recall electron groups. So let's write that as an electron group. So electron groups will be what? Single bonds, double bonds, triple bonds, pastly, long pairs. So each one of these counts has one electron group. So a double bond counts as one electron group. A triple bond counts as one electron group. A long pair counts as one electron group. And a single bond counts as one electron group. So if we look at an atom, and we just think about electron groups, OK? So if this thing's got, and again, the electron groups can be any of these things, OK? So if it's got two electron groups around it, make them bonds, that's something like that. If it's like that, then this x is linear, right? So two electron groups is linear. If you've got three electron groups, don't necessarily have to be all bonds. You've got four of them. You guys know this stuff already, yeah? Five. Yeah, trigonal bipyramidal, so it's going to look something like, I don't know, are you guys cheating when you make the list? Absolutely. Oh, OK. Optic B is nice. B is six. And what is that one? Optic B. Optic B. The structure is derived from these electronic structures. So if you've got pairs, you've got bonding, bonded atoms, OK? But this, again, is just electronic structure here. OK, any questions about that?