Additionally, protective fences 930 extend downward from {HEAD ~ the bottom} of {TAIL ~ lower tabs} 925 of retention channels 915 
Additionally , protective fences 930 extend downward from { HEAD ~ the bottom } of { TAIL ~ lower tabs } 925 of retention channels 915
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH