The automatic generator includes a specification tool for specifying {HEAD ~ a set} of {TAIL ~ block descriptions representative} of specified portions of a database 
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The automatic generator includes a specification tool for specifying { HEAD ~ a set } of { TAIL ~ block descriptions representative } of specified portions of a database
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH