Suitable sacrificial materials include polymers such as wax and epoxies, {HEAD ~ metals} such as {TAIL ~ aluminum}, and glass 
such as
Suitable sacrificial materials include polymers such as wax and epoxies , { HEAD ~ metals } such as { TAIL ~ aluminum } , and glass
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH