The replacement of the value by the new value modifies {TAIL ~ the computer program} while the computer program is executed by {HEAD ~ the processor} 
The replacement of the value by the new value modifies { TAIL ~ the computer program } while the computer program is executed by { HEAD ~ the processor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD