The term 'fire generator' was coined to explain the function of Ga2-26, viz. to initiate the 31 period long calendar beginning with Ga2-27:
Ga2-22
Ga2-23
Ga2-24
Ga2-25
Ga2-26
period 1
Ga2-27
Ga2-28
Ga2-29
Ga3-1
Ga3-2
Ga3-3
Ga3-4
Ga3-5