{HEAD ~ The bone model} produced by the present invention can be used as {TAIL ~ an optimum substitute} for the real bone for this purpose 
used as
{ HEAD ~ The bone model } produced by the present invention can be used as { TAIL ~ an optimum substitute } for the real bone for this purpose
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH