Consequently {HEAD ~ the only word line} required for enabling {TAIL ~ the ROM cells} is the word line which enables the RAM cells 
required for enabling
Consequently { HEAD ~ the only word line } required for enabling { TAIL ~ the ROM cells } is the word line which enables the RAM cells
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH