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