The underside of the barrier is preferably provided with {HEAD ~ a number} of {TAIL ~ projections} for spacing it away from the upper surface of the shed 
of
The underside of the barrier is preferably provided with { HEAD ~ a number } of { TAIL ~ projections } for spacing it away from the upper surface of the shed
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH