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