So let's begin by trying to determine which one of those it is. So let's begin by assuming that we're dealing with an autosomal recessive mode of inheritance. Okay? So remember, the way that we carry out these pedigrees is by beginning is by assuming something. And then with that assumption, we have to check the consistency of that particular pedigree. That is, is this consistent with the information that is given to us in this pedigree?