It is intended that {HEAD ~ a plurality} of such reflective pairs or {TAIL ~ groups} may be assembled in a properly oriented bank of any desired length, according as the energy demands of the application required 
of
It is intended that { HEAD ~ a plurality } of such reflective pairs or { TAIL ~ groups } may be assembled in a properly oriented bank of any desired length , according as the energy demands of the application required
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH