{HEAD ~ The end conductive segments} at {TAIL ~ each polygon vertex} in the outermost row are disjoined in the outermost row 
at
{ HEAD ~ The end conductive segments } at { TAIL ~ each polygon vertex } in the outermost row are disjoined in the outermost row
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH