{HEAD ~ This torsion bar axle suspension system} is relatively uncomplicated and allows {TAIL ~ a greater range} of axle movement due to the pair of links coupling the torsion arms to the oscillating axle assembly 
allows
{ HEAD ~ This torsion bar axle suspension system } is relatively uncomplicated and allows { TAIL ~ a greater range } of axle movement due to the pair of links coupling the torsion arms to the oscillating axle assembly
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