The frame includes a selected number of horizontal muntins and {HEAD ~ vertical mullions} defining {TAIL ~ a plurality} of clear window openings 
The frame includes a selected number of horizontal muntins and { HEAD ~ vertical mullions } defining { TAIL ~ a plurality } of clear window openings
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH