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<Paper uid="W01-0714">
  <Title>References</Title>
  <Section position="8" start_page="0" end_page="0" type="concl">
    <SectionTitle>
7 Conclusion
</SectionTitle>
    <Paragraph position="0"> We present two unsupervised grammar induction systems, one of which is capable of producing declarative, linguistically plausible grammars and another which is capable of reliably identifying frequent constituents. Both parse free text with accuracy rivaling that of weakly supervised systems.</Paragraph>
    <Paragraph position="1"> Ongoing work includes lexicalization, incorporating unary rules, enriching the models learned, and addressing the limitations of the systems.</Paragraph>
  </Section>
class="xml-element"></Paper>