So we have a lighter coat and we have a darker coat. Now, the chocolate coat or the black coat depends on the second gene type. So if we have uppercase D, uppercase D, and we have, let's say, uppercase B, uppercase B. So if we have a homozygous dominant for D, and we have a homozygous dominant for the B, then we're going to produce a black coat color. And likewise, if we have a homozygous dominant for D and a heterozygous four B, so at least one of it is dominant, we're still going to produce the color black. But if we have a homozygous dominant and a homozygous recessive for the B gene, then we're going to produce a lighter color.