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