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