And now if we rotate this fragment 180 degrees along the X axis going this way, we essentially flip it this way. Then what we get is the three will go on the bottom, this five will go on the top, this five will go in the bottom, this three will go on the top. And so will these sequences. And notice what we get after the two fold rotation, the 180 degree rotation about the Y and the X axis. We essentially produce a molecule that is exactly like this molecule here. And that's exactly what we mean by a palindromic sequence.