Among the Shresthas, since they are subdivided into two general sub-castes, the higher Chatharīya and the lower Pāñcthariya, one's marriage partner must be from the same grade as well. Rajopadhyaya and higher Chatharīya clans also try to avoid "Sa-Gotra" marriages; marrying someone of the same gotra. Traditional families also get advice from family Jyotishi/Joshi for horoscope match-making. For most Newars, partners must belong to different descent-group lineages within the same caste. In some areas the rule of "seven generations" of descent is observed; members who fall within the common descent group of seven generations are restricted from intermarriage.