More particularly, {TAIL ~ the present invention} relates to a bicycle drive unit wherein {HEAD ~ a bicycle} moves forward when pedals are stepped on backward as well as when the pedals are stepped on forward, and the bicycle moves forward and backward or idles upon clockwise and counterclockwise pedaling 
More particularly , { TAIL ~ the present invention } relates to a bicycle drive unit wherein { HEAD ~ a bicycle } moves forward when pedals are stepped on backward as well as when the pedals are stepped on forward , and the bicycle moves forward and backward or idles upon clockwise and counterclockwise pedaling
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