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