Manavashrautasutra 6.2.2.3

6.2.2.3

raśminā kṣayāya kṣayaṃ jinva \\ iti trayastrim̐śatam̐ stomabhāgā dikṣu / pūrvārdhād upakramya pradakṣiṇam̐ saptasapta pañca madhye //

With [the formulas beginning with] “By a ray quicken dominion for dwelling,” [he places] thirty-three stomabhāgā [bricks] in the quarters: starting from the eastern half, clockwise, seven in each, [and] five in the middle.