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