In {TAIL ~ a three wire configuration}, {HEAD ~ an additional neutral point} is formed by coupling together another set of three resistors 
In { TAIL ~ a three wire configuration } , { HEAD ~ an additional neutral point } is formed by coupling together another set of three resistors
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH