 Si ka duwan guruubyada, Heerarka shaxda miiska diwaanka curiye ma lahan magacyo u gaar ah, laakiin waxaa lagu kala soocaa tiro kuwaas oo kala ah: heerka 1aad, heerka 2aad, heerka 3aad, heerka 4aad, heerka 5aad, heerka 6aad, iyo heerka 7aad. 