The choice of material will depend on a variety of factors such as {HEAD ~ the physical and chemical properties} of {TAIL ~ the material} being employed 
The choice of material will depend on a variety of factors such as { HEAD ~ the physical and chemical properties } of { TAIL ~ the material } being employed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH