So this is the five end. This is the three end. And instead of drawing out this entire nucleic acid every single time, this is the shortcut mechanism that we can basically use to write out this entire sequence. So this is the beginning, the five N. And we simply write that type of base. So we have Adenine A, we have Guanine that's G and we have citizen that's C. And every time you write this, we know this is the picture that we should be imagining inside our heads. So this is how you basically write our nucleic acids.