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