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