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