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