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    <http://www.w3.org/1999/02/22-rdf-syntax-ns#value> "8"
  ];
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  <http://schema.org/workExample> [
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  <https://w3id.org/jp-textbook/authorizedYear> "2019"^^<http://www.w3.org/2001/XMLSchema#gYear>;
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  <https://w3id.org/jp-textbook/grade> 4;
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  <https://w3id.org/jp-textbook/subject> <https://w3id.org/jp-textbook/curriculum/小学校/2020/理科/理科>;
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