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 <volume>18</volume>
 <number>2</number>
 <month>June</month>
 <year>1989</year>
 <conference>ACM SIGMOD Conference</conference>
 <date>May 31 - June 2, 1989</date>
 <confyear>1989</confyear>
 <location>Portland,
Oregon</location>
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