{HEAD ~ Protuberances} within {TAIL ~ the shelf retainer} engage the top edge of the shelf bracket to prevent cutting of the retainer by the bracket in the presence of high stresses 
within
{ HEAD ~ Protuberances } within { TAIL ~ the shelf retainer } engage the top edge of the shelf bracket to prevent cutting of the retainer by the bracket in the presence of high stresses
HEAD HEAD HEAD HEAD HEAD REL TAIL 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 OTH OTH OTH OTH