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