A hole may be formed in the trench and contact {TAIL ~ a section} of {HEAD ~ the metal layer} 
A hole may be formed in the trench and contact { TAIL ~ a section } of { HEAD ~ the metal layer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD