{HEAD ~ Header file} 900 may have definitions of virtual types and {TAIL ~ values} for each virtual type coded in a computer program 
have
{ HEAD ~ Header file } 900 may have definitions of virtual types and { TAIL ~ values } for each virtual type coded in a computer program
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH