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