In addition, such a process generally necessitates that {HEAD ~ the blades} and disk have {TAIL ~ a common composition} 
In addition , such a process generally necessitates that { HEAD ~ the blades } and disk have { TAIL ~ a common composition }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL