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