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    <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/">Discrete Mathematics : An Open Introduction</dc:title>
    <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">
   Oscar Levin
   Pengarang
  </dc:creator>
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    <dc:subject xmlns:dc="http://purl.org/dc/elements/1.1/">Discrete Mathematics</dc:subject>
  </oai_dc:dc>
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