And the A can either come from this normal dATP or the abnormal Ddatp that lacks the hydroxyl. And if it's this group here, then once again we will stop the synthesis and this fragment will be produced. Now, if it wasn't that molecule, then we would add the next. So if the A was normal, the normal dATP, it would produce the next nucleotide in line. And so the next one is also an A because this is a T. So once again, this is an A. And now we have a possibility between this one or this one.