{HEAD ~ A collapsible trailer} to be towed by {TAIL ~ a bicycle} has front and rear U shaped members pivotally mounted on an axle to the ends of which wheels can be attached 
to be towed by
{ HEAD ~ A collapsible trailer } to be towed by { TAIL ~ a bicycle } has front and rear U shaped members pivotally mounted on an axle to the ends of which wheels can be attached
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