Manasara 7.56

7.56

ekāśītipadaṃ kṛtvā madhye navapadaṃ vidhim
pūrve rasapadaṃ caiva tadevamāryamanaḥ smṛtam

Having made eighty-one plots, [assign] nine plots in the middle to Vidhi; / six plots in the east, that is considered [the place] of Aryaman;