{HEAD ~ The S bent line} may include, instead of or in addition to circular arc curved lines, for example, an elliptic arc curved line, sinusoidal curved line, exponential curved line and {TAIL ~ a combination} of any curved and straight lines 
include
{ HEAD ~ The S bent line } may include , instead of or in addition to circular arc curved lines , for example , an elliptic arc curved line , sinusoidal curved line , exponential curved line and { TAIL ~ a combination } of any curved and straight lines
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH