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