They have complementary base pairing. So the G bases with our C and the A bases with our T. So once we know this sequence, we know what the other sequence is simply by the base parent process. So let's choose this single stranded DNA molecule. We isolate it, we place it into our beaker that contains only this molecule here. And then we move on to step number two. And in step number two, we want to basically replicate this DNA molecule.