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