We have 1234-5678 H atoms and we have eight H atoms here. And finally, we have 1234 oxygens. 1234 oxygen. So essentially they have the same number and type of atoms, but they differ in their arrangement of those atoms in the three dimensional space. And notice that these are not examples of enantomers, because if we draw a line here, they will not be mirror images. And so what that means is, if they're not mere images, they're not an answers, they must be disregards.