At {HEAD ~ the aft portion} of {TAIL ~ the index divider} are two lateral tabs which project outward and are retained in a vertical groove along the right and left sides of the box 
of
At { HEAD ~ the aft portion } of { TAIL ~ the index divider } are two lateral tabs which project outward and are retained in a vertical groove along the right and left sides of the box
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH