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