Final answer:
To avoid duplication of layer names in the PDF, you can include layer information in the export settings, rename any duplicate layer names manually, and use clear and descriptive names for your layers.
Step-by-step explanation:
When exporting to a PDF to avoid duplication of layer names, you can select the 'Include Layer Information' option in the export settings. This will embed the layer names in the PDF file and prevent any duplicate names from occurring.
Additionally, you can also manually rename any duplicate layer names in your design software before exporting. By giving each layer a unique name, you can ensure that there are no duplicates in the PDF.
Lastly, it's good practice to stay organized and use clear and descriptive names for your layers. This can help prevent confusion and duplication when exporting to PDF or working on collaborative projects.