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