The method creates a sequence of {HEAD ~ runs} of insulating glass units to be produced for assembly to {TAIL ~ window or door sash} and frames at a plurality of glazing lines 
The method creates a sequence of { HEAD ~ runs } of insulating glass units to be produced for assembly to { TAIL ~ window or door sash } and frames at a plurality of glazing lines
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH