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