Hook anchor 464 and vertical movement retainer 468 are positioned such that sufficient clearance is provided to allow easy accessibility of a hook to hook anchor 464, and easy manual insertion and removal of a hook from {HEAD ~ hook anchor} 464 upon {TAIL ~ appropriate manipulation} of the hook 
upon
Hook anchor 464 and vertical movement retainer 468 are positioned such that sufficient clearance is provided to allow easy accessibility of a hook to hook anchor 464 , and easy manual insertion and removal of a hook from { HEAD ~ hook anchor } 464 upon { TAIL ~ appropriate manipulation } of the hook
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