The angle formed between the intersection of {HEAD ~ first run} 20 with {TAIL ~ second run} 22 is, in the preferred embodiment, a right angle 
The angle formed between the intersection of { HEAD ~ first run } 20 with { TAIL ~ second run } 22 is , in the preferred embodiment , a right angle
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH