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