There's one conference, a second conference, a third conference, a fourth conference, and so on. Two important conference that you should know are the Eclipse conference and the staggered confirmer. Now, Eclipsed simply means that these two ch bonds are eclipsed. They're on the same plane. So if we look this way on our molecule, so here is our molecule and we're looking this way, we're going to see that this carbon bond, this carbon H bond exactly aligns with this carbon H bond. And likewise this carbon H bond aligns with this and this carbon H bond aligns with, aligns with this one.