<project>
  ...
  <build>
    ...
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-site-plugin</artifactId>
      <configuration>
        <outputEncoding>UTF-8</outputEncoding>
      </configuration>
   </plugin>
   ...
  </build>
  ...
</project>

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