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