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. We're going to produce a brown or chocolate coat color. And the same thing is true for the heterozygous if we have a heterozygous for our D gene. So if at least one of these is a dominant gene, then we're going to produce a darker coat color.