{HEAD ~ Each} of {TAIL ~ the gate structures} may interpose a source region and a drain region 
{ HEAD ~ Each } of { TAIL ~ the gate structures } may interpose a source region and a drain region
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH