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