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  1. create a new style, for example Header1bis, based on Header 1;
  2. set the style to the "Introduction", "Conclusion" and "Résumé" header;
  3. right click the table of contents and select Edit index/table;
  4. under the Index tab, check Additional styles and click the corresponding icon ();
  5. in the Additional style window that opens, select the new style Header1bis;
  6. set the required level for the table of contents using the >> and << buttons: choose a level that is not used, for example 10;
  7. press OK;