{HEAD ~ The artificial bone model} can be used for {TAIL ~ educational training} or for studying a plan for curing before a surgical operation 
used for
{ HEAD ~ The artificial bone model } can be used for { TAIL ~ educational training } or for studying a plan for curing before a surgical operation
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH