The window 9 wherein {TAIL ~ said window} further includes a third portion offset from said first portion and completely within and spaced from said peripheral edges of {HEAD ~ said sheet} 
The window 9 wherein { TAIL ~ said window } further includes a third portion offset from said first portion and completely within and spaced from said peripheral edges of { HEAD ~ said sheet }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL 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