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