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