In a further embodiment, {HEAD ~ at least one line} has {TAIL ~ more than n straight line segments} 
has
In a further embodiment , { HEAD ~ at least one line } has { TAIL ~ more than n straight line segments }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL