And that's why we have the dye, because we have these two aster bonds that are linked together by the phosphate group that in turn link together these two sugar molecules in a three to five fashion. So that's what a three prime to five prime phosphodite as the linkage is. So the hydroxyl group on the third carbon of one sugar. So this third carbon, this is the hydroxyl, the oxygen of that hydroxyl is connected to the hydroxyl group on the fifth carbon of the adjacent sugar. So this carbon here, this is the oxygen of that hydroxyl group and they're connected by this phosphate group. And that's exactly what we mean by three prime to five prime phosphodi as the linkage.