How to Fix 'Each child should have a unique key prop?

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Hi everyone I would like to display for each element all of its sub-documents.

  <div><ul>{designModdulles.map((designModdulle)=><li key={designModdulle.epreuves.nature_epreuve}>{designModdulle.epreuves.nature_epreuve}</li>) }</ul></div>
```
I wanted the sub documents to be displayed` in a map
but i had: Warning: Each child in a list should have a unique "key" prop.


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