It looks like your question got cut off. However, I can explain the general role of supporting details in writing.
Supporting details are specific pieces of information that help to clarify, explain, or provide evidence for the main idea or argument presented in a piece of writing. Here are some key roles that supporting details play:
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Clarification: They help to make the main idea clearer by providing examples, definitions, or explanations.
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Evidence: Supporting details can serve as evidence to back up claims or arguments, making them more credible and persuasive.
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Engagement: They can make a text more engaging and interesting by adding depth and richness to the content.
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Development: Supporting details help to develop the main idea further by providing additional information or context, which can enhance understanding.
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Structure: They contribute to the organization of the writing by breaking down larger ideas into manageable parts.
If you have a specific context or question in mind regarding supporting details, please feel free to provide more information so I can assist you better!