As discussed earlier, the glass sheet 10 must also be heated to relieve any internal stresses resulting from the concentrated heat and prevent {HEAD ~ thermal fracturing} of {TAIL ~ the glass} 
As discussed earlier , the glass sheet 10 must also be heated to relieve any internal stresses resulting from the concentrated heat and prevent { HEAD ~ thermal fracturing } of { TAIL ~ the glass }
OTH OTH OTH OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL