System 500 may be {HEAD ~ any system}, such as {TAIL ~ a server computer system} for example 
System 500 may be { HEAD ~ any system } , such as { TAIL ~ a server computer system } for example
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH