{HEAD ~ The wall} limits {TAIL ~ vertical movement} of a hook connected to the hook anchor to prevent inadvertent disengagement by vertical movement 
{ HEAD ~ The wall } limits { TAIL ~ vertical movement } of a hook connected to the hook anchor to prevent inadvertent disengagement by vertical movement
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