{HEAD ~ The lateral tabs} prevent {TAIL ~ the index dividers} from sliding forward and allow the index dividers to ride up or down in the vertival slots as the stack of sandpaper sheets changes 
prevent
{ HEAD ~ The lateral tabs } prevent { TAIL ~ the index dividers } from sliding forward and allow the index dividers to ride up or down in the vertival slots as the stack of sandpaper sheets changes
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 OTH