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