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