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<Paper uid="C80-1087">
  <Title>Programming</Title>
  <Section position="8" start_page="0" end_page="0" type="ackno">
    <SectionTitle>
Acknowleqdements
</SectionTitle>
    <Paragraph position="0"> I am indebted to the members of several research groups at Xerox Palo Alto Research Center and to many members of the HIT AI and LOGO Lab for giving me a chance to visit both places several limes over a longer period of time and letting me explore and work with their systems. H.-D. Boecker has made substantial contributions to this paper.</Paragraph>
    <Paragraph position="1"> --576--</Paragraph>
  </Section>
class="xml-element"></Paper>