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