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