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