The roller receives the heat emission part and has at least one opening to provide {HEAD ~ heat} to {TAIL ~ a target}  
to
The roller receives the heat emission part and has at least one opening to provide { HEAD ~ heat } to { TAIL ~ a target }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH