So DNA molecule number one and DNA molecule number two that basically came from two different sources. And what we want to do is we want to somehow combine these two DNA molecules and to form a single recombinant DNA molecule that consists of these two different DNA molecules. So the way that we do it is we basically realize that let's say these two different DNA molecules both contain these Palindromic sequences that we discussed earlier. So let's say this is the Palindromic sequence on this molecule that reflects this. And this is the Palindromic sequence on the second DNA molecule that also reflects this sequence here. So we have the red, the red, the orange, the light purple, dark purple, dark purple that reflects this.