Once {HEAD ~ the minimum number} of {TAIL ~ index entries} is determined a grid can be partitioned into the appropriate number of grid cells to support efficient grid indexing 
of
Once { HEAD ~ the minimum number } of { TAIL ~ index entries } is determined a grid can be partitioned into the appropriate number of grid cells to support efficient grid indexing
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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