G		gc
References of "gc" (Variables in Calculation)

gc	Folio 75 v,c13
	Folio 105 r,c02
	Folio 130 r,c02
	Folio 166 r,c01
	Folio 184 v,c19
	Folio 192 r,c01
	Folio 192 r,c08