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