When {HEAD ~ the editor} receives {TAIL ~ the output}, it stores the output in a file and displays it on a computer monitor 
receives
When { HEAD ~ the editor } receives { TAIL ~ the output } , it stores the output in a file and displays it on a computer monitor
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH