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