{TAIL ~ One such application} is to control {HEAD ~ the amount} of light, ambient or otherwise, entering through a window 
{ TAIL ~ One such application } is to control { HEAD ~ the amount } of light , ambient or otherwise , entering through a window
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH